Title: CR oscillation circuit and electronic device
Application Number: 200580012254 Application Date: 2005.11.15
Publication Number: 1947335 Publication Date: 2007.04.11
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03K3/354;H03B5/20
Applicant(s) Name: Rohm Co., Ltd. Address:
Inventor(s) Name: Nakashima Takayuki
Attorney & Agent: shaoya li lixiao shu
Abstract:
    It is preferable to increase the selection scope of oscillation frequency adjustment means. In a CR oscillation circuit (100), a first oscillation capacitor (C1) and a second oscillation capacitor (C2) are arranged in parallel so that a capacity value of the entire CR oscillation circuit (100) can be selected. A plurality of resistors including at least one variable resistor such as a fifth trimming resistor (116e) are arranged in series, so that the resistance value of the entire CR oscillation circuit (100) can be selected by adjusting the resistance value of the fifth trimming resistor (116e). The minimum value CMIN and the maximum value CMAX which can be selected as a capacitance value of the entire CR oscillation circuit (100) and the minimum value RMIN and the maximum value RMAX which can be selected as a resistance value of the entire CR oscillation circuit (100) are in the relationship as follows: CMIN RMAX = CMAX RMIN.
Time: 11
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