公开(公告)号：US11196385B2

公开(公告)日：2021-12-07

申请号：US16793985

申请日：2020-02-18

Applicant: Silicon Laboratories Inc.

Inventor： Ruifeng Sun ,  Ricky Setiawan ,  Ben Wee-Guan Tan

IPC: H03F1/02 ,  H03F3/21 ,  H03F3/193

Abstract: A power amplifier for a radio frequency transceiver including a driver, a disable circuit, and a bias circuit. The driver includes a source node for receiving a drive voltage when enabled and includes an output node that is susceptible to strong blocker signals when disabled. The bias circuit includes first and second bias nodes for driving the voltage level of the source and output nodes, respectively, to suitable bias voltage levels to minimize impact of blocker signals. The disable circuit includes switch circuits to couple the driver to the bias circuit in the disable mode. The bias circuit may include at least one voltage source. The bias circuit may be coupled to a supply voltage and may include a voltage divider coupled between the source and output nodes. The bias circuit may include a source-follower circuit to isolate the bias voltages from variations of the supply voltage.

公开(公告)号：US20210257970A1

公开(公告)日：2021-08-19

申请号：US16793985

申请日：2020-02-18

Applicant: Silicon Laboratories Inc.

Inventor： Ruifeng Sun ,  Ricky Setiawan ,  Ben Wee-Guan Tan

IPC: H03F1/02 ,  H03F3/193 ,  H03F3/21

Abstract: A power amplifier for a radio frequency transceiver including a driver, a disable circuit, and a bias circuit. The driver includes a source node for receiving a drive voltage when enabled and includes an output node that is susceptible to strong blocker signals when disabled. The bias circuit includes first and second bias nodes for driving the voltage level of the source and output nodes, respectively, to suitable bias voltage levels to minimize impact of blocker signals. The disable circuit includes switch circuits to couple the driver to the bias circuit in the disable mode. The bias circuit may include at least one voltage source. The bias circuit may be coupled to a supply voltage and may include a voltage divider coupled between the source and output nodes. The bias circuit may include a source-follower circuit to isolate the bias voltages from variations of the supply voltage.