Patent ID: 7106138

Claim:
A circuit for providing linear in decibel gain control in response to gain control voltage, the circuit adapted to couple to a driver amplifier circuitry including a bipolar junction transistor and a matching circuit, the circuit comprising: a linear transconductor receiving an input voltage and providing a control current based on input voltage received; temperature compensation circuitry for varying current from the linear transconductor according to absolute temperature; an exponential current controller receiving current varied according to temperature from the temperature compensation circuitry and providing an exponential current in response; and an inductive degeneration compensator for receiving exponential current from the exponential current controller and providing a control current to the driver amplifier circuitry compensating for inductive degeneration due to at least one inductor in the driver amplifier circuitry, the control current passing from the inductive degeneration compensator to the bipolar junction transistor and the matching circuit of the driver amplifier circuitry to generate an output gain that varies linearly in decibels with respect to the input voltage.