Abstract: The present disclosure includes a discussion of a radio receiver. The radio receiver has at least two operational states and includes a variable gain amplifier and at least two adaptive DC offset compensators (421, 427) to suppress undesired DC offset. The first operational state of the radio receiver (121) adjusts the adaptive DC offset compensator circuits (421, 427) to appropriate output levels in absence of an input signal to the radio (121). The second operational state receives the input signal through the radio receiver (121) and eliminates the undesired DC offset (309) from the received input signal with the adaptive DC offset compensator circuits (421, 427) and allows the received input signals to be processed.

Abstract: A radio receiver (107) including at least two amplifier (245, 247, 207) stages each having adjustable gain. The receiver (107) generates a first and a second control signal (267, 229). In absence of receiving an input signal, the receiver (107) adjusts the gain of at least the first of the at least two amplifier stages (207) with said first control signal (229). Upon generation of the second control signal (267) the gain of the first of the at least two amplifiers stages (207) is maintained at a constant level. The gain of a second of the at least two amplifier stages (247) is adjusted with said first control signal (229), producing an output signal (269). A predetermined amplitude of the output signal (269) is maintained while receiving an input signal.

Abstract: A linear-to-exponential converter circuit for generating a temperature-independent signal which is exponentially related to an input signal. An amplifier stage forming an exponential multiplier is comprised of a bipolar junction transistor which, characteristic of bipolar junction transistors, generates a current at a collector electrode which is dependent upon temperature. A signal to be amplified by the expontential multiplier formed of the bipolar junction transistor is first provided to a temperature compensation circuit. The temperature compensation circuit introduces a temperature dependency upon the input signal which is the inverse to that of the temperature dependency of the bipolar junction transistor of the amplification circuit. The temperature dependency of the amplified signal is removed, and a temperature-invariant signal is produced thereby.