Cmos oscillator

Details Cmos oscillator Cmos oscillator

H - Electricity

03

K

331/29

H03K 3/53 (2006.01) H03K 3/0231 (2006.01) H03K 3/354 (2006.01)

Patent

CA 2012556

A high-speed, temperature- and parameter-stable, controllable CMOS oscillator is suitable for low to very high frequencies, e.g., clearly above 100 MHz. The oscillator includes a two-stage differential amplifier (D) and two controlled current sources (I1, I2) which are interconnected via a frequency- determining capacitor (C). The two current sources (I1, I2) are connected to the inputs (IN1, IN2) of the differential amplifier (D) through a first resistor (R1) and a second resistor (R2), respectively. By means of a first switching unit (S1) connected to the inputs of the differential amplifier (D), a first current path is completed in response to the voltage drop across the first resistor (R1) to charge the capacitor to a first state, and by means of a second switching unit (S2), a second current path is completed in response to the voltage drop across the second resistor (R2) to discharge the capacitor (C) to a second state.

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