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CMOS TEMPERATURE COMPENSATED TRANSMITTER CIRCUIT WITH MERGED MIXER AND VARIABLE GAIN AMPLIFIER
CMOS TEMPERATURE COMPENSATED TRANSMITTER CIRCUIT WITH MERGED MIXER AND VARIABLE GAIN AMPLIFIER
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机译:混合混频器和可变增益放大器的CMOS温度补偿发射电路
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摘要
A CMOS automatic gain control (AGC) circuit that receives an analog control voltage and generates a temperature compensated gain voltage to linearly control the gain of a variable gain circuit operating in the sub-threshold region. A PTAT circuit having a resistor network coupled to a current mirror circuit operating in the sub-threshold region establishes a current having an proportional relationship to temperature. This current is used as a supply for a voltage to voltage converter circuit which generates an intermediate voltage in response to the analog control voltage. A linearizing circuit operating in the sub-threshold region pre-conditions the intermediate voltage, which is then applied to a variable gain circuit. The variable gain circuit is operated in the sub-threshold region, and the preconditioned intermediate voltage will control the amount of gain to be substantially linear with respect to the analog control voltage, and with a range of about 85dB.
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