Invention Grant
- Patent Title: Circuits, systems, and methods for managing automatic gain control in quadrature signal paths of a receiver
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Application No.: US13361247Application Date: 2012-01-30
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Publication No.: US08565358B2Publication Date: 2013-10-22
- Inventor: Jaleh Komaili , John E. Vasa , Thomas Obkircher
- Applicant: Jaleh Komaili , John E. Vasa , Thomas Obkircher
- Applicant Address: US MA Woburn
- Assignee: Skyworks Solutions, Inc.
- Current Assignee: Skyworks Solutions, Inc.
- Current Assignee Address: US MA Woburn
- Agency: Knobbe, Martens, Olson and Bear, LLP
- Main IPC: H04B17/00
- IPC: H04B17/00

Abstract:
A system provides closed-loop gain control in a WCDMA mode and open loop control in an EDGE/GSM mode. Gain control is distributed across analog devices and a digital scaler in a wireless receiver. In the WCDMA mode, a loop filter generates an error signal that is forwarded to analog and digital control paths. The analog control path includes a first adder, a programmable hysteresis element, and a lookup table. The analog control signal is responsive to thresholds, which when used in conjunction with a previous gain value determine a new gain value. The digital control path includes a second adder, a programmable delay element, and a converter. A control word is responsive to a difference of the error signal, a calibration value, and the analog control signal. Blocker detection is provided in the WCDMA mode of operation. A controller sets system parameters using a state machine.
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