Low voltage vco temperature compensation

Details Low voltage vco temperature compensation Low voltage vco temperature compensation

H - Electricity

03

B

H03B 5/04 (2006.01) H03L 1/02 (2006.01) H03B 1/00 (2006.01)

Patent

CA 2064086

2064086 9101590 PCTABS00003 A circuit (10) for temperature compensation of a varactor voltage controlled oscillator control signal (Vtune) includes a proportional to absolute temperature (PTAT) current source (32) and an adjustable, temperature stable current source (34). The difference between these two current sources defines an offset current (I2-I1, 40). The varactor control signal voltage (VIN) is shifted by a predetermined reference voltage (VREF) and offset by an offset voltage proportional to the offset current (I2-I1), in a differential amplifier portion of the circuit (36), to provide a tuning signal (Vtune) for controlling the varactor (DVCO) so as to compensate for the varactor capacitance temperature drift. The adjustable, temperature stable current source (34) allows tuning (R1) the circuit in order to precisely tune the VCO to a desired frequency under a predetermined set of operating conditions in order to correct component and process variations.

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