Logic mixer circuit and method This invention relates to mixture circuited and its method in measurement, which comprises the following steps: providing logic mixture circuit input as rectangle singles through logic pa...
Frequency converter and tuner A frequency changer (3, 4) is provided for a radio frequency tuner (1-7). The frequency changer comprises a mixer (3) comprising a plurality of mixing stages (10a, 11a; 10b, 11b; 10c, 11c...
Semiconductor integrated circuit
In a communication semiconductor integrated circuit, a capacitance included in a filter on the output side of a mixer circuit is reduced without requiring the cutoff frequency of the fil...
10
200610072733
Analogue multiplier
An analogue multiplier circuit has an input coefficient voltage dependent adjustment of its frequency response. The multiplier contains a multiplier cell (MC) with an RF input (Vin , Vin...
11
200610080104
Post-im3-cancellation frequency translation
A method, of reducing distortion due to a third order intermodulation (IM 3 ) product, may include: receiving an original signal; and performing, before frequency translation is done to ...
12
200610009357
Semiconductor device and driving method thereof
The invention provides a semiconductor device with high yield by reducing an effect of variations in characteristics of a semiconductor element. Further, by reducing an effect of variati...
Frequency modulation receiver and its demodulation method This invention relates to a FM receiver and its demoduoation method, in which, the FM receiver is composed of a Hartely structure mixture, an image suppression filter, a limiter and a FM ...
15
200510022225
Image suppression frequency mixer
This invention relates to microwave image rejection mixer integration technique, which comprises Equal phase power dividing circuit, two couple resonance wave mixer units, two middle fre...
Mixer of direct-conversion RF receiver
Disclosed is a mixing device of a direct conversion radio frequency receiver, which comprises gain circuit, load circuit and conversion circuit. The gain circuit receives difference RF s...
18
200510082580
Radio-frequency receiver and receiving method The invention comprises: an antenna for receiving RF signals; a low noise amplifier coupled to the antenna and used to amplify the received RF signals; a direct conversion unit coupled to...
19
200510041159
Method of shift frequency and changing frequency This invention relates to a frequency shift and conversion method, in which, at the near end of a repeater, a low noise amplifier receives and amplifies signals of a base station to send ...
20
200510081913
Radio-frequency receiver and radio frequency receiving method The radio frequency receiver includes a unit for descending frequency, a harmonic filtration unit, a first ascending frequency unit, and a second ascending frequency unit. Receiving a sig...
Balanced mixer using fits A double balanced mixer has a DC detection circuit connected to receive the output of the mixer core. The detected level is applied to adjust the duty cycle of the transistors of the mixe...
Low noise frequency demultiplier
The frequency demultiplier with low noise comprises: a low-noise amplifier to receive a RF input signal, a RF bandpass filter coupled with last device, a mixer, a local oscillator to pro...
Orthogonal frequency division multiplexing receiver
A receiver for orthogonal frequency division multiplexing signals, including an A/D converter (52) for converting receiver analog signals to a digital signal data stream, wherein the dig...
Image removing circuit An image removing circuit which can remove an image signal without being affected by element variance generated upon manufacture of elements such as resistance and capacitor. The image re...
Analog DC compensation The present invention relates to an arrangement (1) for an analogue compensation of a DC component (A) in an AC signal (B), comprising an estimating unit (2), adapted to produce an estima...
31
200510069468
High carrier inhibited up-conversion mixing system
The invention provides the rising frequency mixing wave system with the high carrier wave depression. The first and the second low pass filters filter the first and the second inputting ...
32
200510072791
Tuner arrangement A tuner arrangement is provided comprising one or more tuners. Each tuner has two or more frequency changers, each comprising a mixer and a local oscillator. A controller controls the loc...
33
200580016567
Volume adjusting apparatus A volume adjusting part (20) adjusts the volume in accordance with the operational amount of a volume operator (44). A howling detecting part (52) detects the occurrence of a howling acco...
Balanced mixer with calibration of load impedances A calibration device (CC) is coupled to a balanced circuit device (MC) comprising first and second outputs respectively provided with first (Z1) and second (Z2) load impedance means. This...
36
200510069601
Single conversion tuner A single conversion tuner suitable for receiving RF signals having different requirements as to selectivity, linearity and image rejection is presented. Tuners of this kind are particular...
37
200580020867
Integrated analog video receiver An analog video receiver implemented in an integrated circuit device. The analog video receiver includes an amplifier to amplify an analog video signal having a desired carrier frequency,...
38
200580021086
System and method for generating a jittered test signal A multi-speed jittered signal generator (216,400) that generates a full-speed jittered signal (404) by scaling a low-speed jittered signal (420) using a frequency scaler (428). The low-sp...
39
200510065968
Satillite signal transmitting method
The method comprises the following steps: a signal receiving device is used to convert the satellite signal to an intermediate frequency signal and transmit the intermediated frequency s...
40
200510076299
Method and apparatus for a gain controlled mixer A gain controlled mixer for an integrated CMOS transceiver. Accuracy of the controlled gain may be relatively invariant over temperature, manufacturing process, and other variations atten...
41
200510038725
Mirror-image suppression low noise amplifier
This invention discloses an image suppression low noise amplifier of a radio communication system receiver including a preamplifier and post amplifier and an output match circuit, among ...
Satellite frequency-reducing device A frequency-reducing device includes two low noise amplifiers, a switching circuit, a wave filter, two oscillators, a wave mixing device, an intermediate-frequency amplifier and a control...
44
200510024964
Circuit for restraining LO leakage
The related circuit to suppress intrinsic leakage comprises: coupling the intrinsic output signal in the second branch as kill channel, delaying, regulating on amplitude and phase to let...
45
200520002790
Signal receiver This utility model relates to a signal receiver including a turning frequency device, a multi selection switch, a router and a microprocessor, wherein, the turning frequency device combin...
46
200510059372
High performance signal generation
A high performance phase detector includes a local digital oscillator for generating a digital reference signal of programmable frequency and phase. The phase detector accumulates a diff...
47
200580010724
Pulse shaping signals for ultrawideband communication An ultrawideband radio frequency pulse is generated by shaping a carrier signal having a selected frequency with a window function. The shaped carrier is gated to produce the ultrawideban...
Fast phase-frequency detector arrangement The present invention relates to a detector arrangement and a charge pump circuit for a recovery circuit recovering timing information for random data. The detector arrangement comprises ...
Method of configuring base station, and base station A base station and a method of configuring a base station are provided in a cellular telecommunication system, wherein the base station comprises an electrically tunable duplex filter wit...
Active mixer with self-adjustable bias feedback
The invention uses a double self-regulation feedback bias voltage construct and includes: a service voltage, a radio frequency input adapting/driving unit, a local oscillator input adapt...
55
200510051951
Frequency down converter and isolative cover thereof
A frequency demultiplier includes a module frame, a frequency demultiplying circuit and an isolation cover, in which, the circuit is set in the frame, the cover is set above the circuit ...
56
200580004622
Radio frequency low noise amplifier with automatic gain control A low noise amplifier (500) includes a first transconductance device (326) having a control electrode for receiving a first input signal, and a first current electrode; a first load devic...
57
200580009862
Transmitter predistortion circuit and method therefor A digital communications transmitter ( 100 ) includes a digital linear-and-nonlinear predistortion section ( 200 ) to compensate for linear and nonlinear distortion introduced by transmit...
Demodulation device and demodulation method
The present invention provides a demodulation device including: a synthesizer generating a local signal; and a mixer mixing an input signal, which is modulated by a carrier frequency, wi...
DC offset correction for direct-conversion receiver A DC offset correction system for a direct-conversion receiver is disclosed that may include a DC feedback correction servo-loop in signal communication with a baseband section, where the...
65
200410097121
Locking-phase loop style orthogonal signal phase calibrator
The invention consists of phase detector, charge pump, loop filter, buffer, low pass filter, and two controllable delay cells. The two output ends of phase detector are connected with th...
66
200410097393
Digital frequency converter A digital frequency converter is provided that maintains a high power efficiency in an EER scheme despite the inclusion of digital signal processing. An inputted modulated signal is conve...
67
200480035904
Bandpass sampling receiver and the sampling method A bandpass sampling receiver is proposed for receiving RF signals, comprising: the first ADC, for converting the RF signal into the first path of digital signal under the control of the f...
68
200480035348
Low power amplitude modulation detector
An AM demodulator using totem pole complementary metal oxide semiconductor transistors having a feedback to provide a common gate voltage of approximately half that across the transistor...
69
200480035172
Mixer circuit
A mixer circuit of a receiving system that must have a low noise characteristic for a low frequency, wherein a bypass current source (41) is connected, in parallel with an LO transistor ...
70
200480036258
Mixer arrangement A quadrature connected passive mixer arrangement for frequency converting analog signals from a first to a second frequency. The arrangement comprises two parallel connected mixers provid...
71
200480040603
Amplifier linearization using non-linear predistortion Apparatus for amplifying an input signal having an input signal power includes a power amplifier, which is adapted to amplify an intermediate signal so as to generate an output signal, an...
72
200410090532
Method and apparatus for quadrature detection and MRI system
Provided is a quadrature detector wherein unnecessary frequency components are not produced, the following procedure is carried out: an analog input signal is converted into a digital si...
73
200410090369
RF mixing device The present invention relates to a radio-frequency mixer arrangement in which a differential amplifier is connected to an input on a multiplier. The differential amplifier is arranged tog...
Ku band satellite frequency demultiplier The utility model refers to a ku band satellite frequency demultiplier, it concatenates mixing unit and local oscillations unit, and simultaneously make use of the characteristic of two c...
79
200480027872
Q-quenching super-regenerative receiver
A super-regenerative receiver uses controlled Q-quenching and may limit the resonant tank circuit amplitude by loading the tank circuit as soon as regenerative oscillation is detected. A...
80
200410011825
Image rejection mixer and multiband generator
The present invention suppresses a harmonic component without impairing the phase orthogonality of a pair of complex signals. A polyphase filter is configured so that K pieces of filter ...
81
200480030928
Method for modulation detection
A method of modulation detection. A signal is received (710). A first decision statistic can be generated based on the received signal (720). The received signal can be transformed (725)...
82
200480031346
Controllable mixer
A heterodyne receiver has a mixer with at least one transistor whose operating point can be varied dynamically. The quality of the output signal from the mixer is assessed in order to co...
83
200480027387
High performance low noise amplifier
A signal processing circuit is proposed, which is intended to receive a pair of input signals Sp and Sn in phase opposition on two input terminals and to provide two pairs of output curr...
Synchronous detection method and device
In a synchronous detection method, an input signal is averaged over at least first and second phase ranges of a target carrier wave within each period thereof to obtain at least first an...
Method for improving timing locking test
The method includes following steps: the sum operation is made for amount of detecting sign of timing locking e(n) in a way of taking M (M is greater than or equal to 1)as a unit, namely...
88
200410057922
Mixer
A frequency mixing consists of frequency mixing module for mixing the first set of differential signal with the second set of differential signal to generate a mixed signal , a common ...
I/Q demodulation circuit
In an I/Q demodulation circuit, an offset amount determined in an offset detection mode is previously stored so that, in a normal reception mode, an offset is corrected for based on the ...
Digital medium-frequency discriminator
In RF receiver, an antenna receives RF signal from outside. After frequency reduction is made through mixer and band pass filter, the RF signal is reduced to if signal. Through if amplif...
Digital phase-frequency identification circuit
The discrimination circuit includes following parts: a first SR latch in use for generating a first output signal at predetermined state setup; a second SR latch in use for generating a ...
95
200410071439
Direct frequency-conversion delta-sigma receiver
The radio signal receiver reverses the polarity of waveform in the half clock period of each frequency varying clock to generate reversed waveform and converts the reversed waveform seri...
Multiple conversion tuner
A multiple conversion tuner comprises a plurality of cascade-connected frequency changers, each of which comprises a mixer and a local oscillator. The tuner also comprises a local oscill...
98
200480015788
Phase locked loop for an OFDM system
Techniques are provided for tracking residual frequency error and phase noise in an OFDM system. At a receiver, each received OFDM symbol is transformed with an FFT to obtain received mo...
Self-calibrating apparatus and method in a mobile transceiver
An apparatus and method for self-calibrating mismatching orthogonal signals and non-linearity of a circuit occurring in a mobile transceiver. For this, in a mobile terminal, a transmitte...
