Triquint Semiconductor Corporation

Rebouh Benelbar

Thomas R Apel

Walter Anthony Wohlmuth

An exemplary circuit embodiment includes a depletion-mode transistor and an enhancement-mode transistor. The circuit also includes a circuit portion coupled to a gate region of the depletion-mode transistor and to a gate region of the enhancement-mode transistor. In this embodiment, the circuit portion is configured to provide a reference voltage at an output node, wherein the reference voltage is associated with a difference between a voltage at the gate region of the depletion-mode transistor and a voltage at the gate region of the enhancement-mode transistor.

Producing reference voltages using transistors

A bias circuit includes a regulator circuit and a current diverting circuit. The regulator circuit includes a load resistor, a first transistor, and feedback control circuitry for biasing the first transistor such that a nominal quiescent current flows through the first resistor and first transistor. A current diverting circuit is coupled in parallel with the first transistor. When the current diverting circuit is disabled, the nominal quiescent current continues to flow through the load resistor and first transistor. When the current diverting circuit is enabled, a diverted current flows through the current diverting circuit, such that the new quiescent current through the first transistor is equal to the nominal quiescent current minus the diverted current. The value of the diverted current is also controlled by the feedback control circuitry. The quiescent current through the first transistor is used as a reference for biasing another circuit.

Robust monolithic automatic bias circuit with current setting apparatus

An amplifier bias system. The amplifier bias system includes a battery voltage supply coupled with an amplifier transistor to be biased; an output node coupled with a gate of the amplifier transistor; and a current source coupled with the battery voltage supply, wherein the current source provides a current to a node in response to the battery voltage supply. The amplifier bias system further includes a first transistor coupled between the battery voltage supply and the output node, the first transistor having a gate coupled with the first node; a second transistor coupled with the first node, the second transistor having a gate coupled with the output node; and a current load coupled with the output node.

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Murphy, TX, United States of America

Rebouh Benelbar