Patent ID: 8072282
Filing Date: 2011-12-06
Classification: H03B,H03L

Abstract:
1. A device for compensating the oscillation frequency, comprising: a generating module, configured to send a voltage control signal to one end of a variable capacitor of an LC oscillating loop to generate oscillating signals in the LC oscillating loop; an obtaining module, configured to obtain a variable bias voltage that reflects changes of an external parameter and send the variable bias voltage to the other end of the variable capacitor to compensate changes to the oscillation frequency of oscillation signals generated in the LC oscillating loop, wherein the obtaining module comprises a first field effect tube and a second field effect tube; and a calculation amplifier coupled to a first resistance and a second resistance, wherein a change in the external parameter varies the second resistance, and wherein an output end of the calculation amplifier is coupled to a grid of the second field effect tube, one input end of the calculation amplifier is coupled to a drain of the second field effect tube, and the other input end of the calculation amplifier is coupled to a benchmark voltage (VBG).