US Patent:
20130176269, Jul 11, 2013
Inventors:
David Amory Sobel - Los Altos CA, US
Sumant Ranganathan - Saratoga CA, US
Xin Dai - Fremont CA, US
Fang Lin - Cupertino CA, US
Assignee:
Broadcom Corporation - Irvine CA
International Classification:
G06F 3/044
H03L 5/00
Abstract:
A mode-configurable amplifier comprises a single-ended input for receiving a received signal from a capacitive touch panel, a differential output operable to carry a differential processed signal to a subsequent processing stage, and processing circuitry in communication with the single ended input and the differential output. The processing circuitry comprises mode selection inputs and mode selection circuitry in communication with the mode selection inputs. The mode selection circuitry is operable to configure the processing circuitry into a current operating mode selected from a high-pass filter mode, bandpass filter mode, and a trans-capacitive gain mode. The high-pass filter mode is operable to high-pass filter the received signal to obtain the differential processed signal. The bandpass filter mode is operable to bandpass filter the received signal to obtain the differential processed signal. The wideband gain mode is operable to amplify the received signal to obtain the differential processed signal.
