Fast-setting, low power, jammer insensitive, biasing apparatus and method for single-ended circuits
AssigneeTexas Instruments Incorporated
InventorsRanjit Gharpurey, Gugliemo Sirna
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AssigneeTexas Instruments Incorporated
InventorsRanjit Gharpurey, Gugliemo Sirna
Estimating the term…
A single-ended circuit, such as an LNA (300), in accordance with the present invention includes an input power matching circuit (310) and a bias circuit (305) connected to an output transistor (Qin) which provides the amplification. A degeneration inductance (Le) and load impedance (Lo) couple to the emitter and collector of the output transistor (Qin), respectively. The bias circuit (305) is configured to eliminate base shot-noise of the mirror transistor (Q1) which generates the amplification. The bias circuit (305) in accordance with the present invention also eliminates the noise of the bias resistor (Rx1) that is included within the bias circuit (305). Specifically, the bias circuit (305) includes a current reference source (Iref) and an emitter follower circuit (315) connected to a current mirror circuit (Q1, Q2, Rx2) that connects to a bias resistor (Rx1). This bias circuit (305) can be implemented in a wide-class of single-ended circuits.
A single-ended circuit, having an input node, an output node, a power supply rail and ground, comprising:
A bias circuit to filter noise comprising:
Dependencies are inferred from the claim text.