Raymond A Perry

US Patent:

7961132, Jun 14, 2011

Filed:

Feb 3, 2010

Appl. No.:

12/699794

Inventors:

Raymond T. Perry - South San Francisco CA, US

Assignee:

Linear Technology Corporation - Milpitas CA

International Classification:

H03M 1/12

US Classification:

341172, 341155

Abstract:

In one embodiment, an A/D converter samples an analog input signal voltage by applying the input signal to a first capacitor terminal, while a second capacitor terminal is connected to ground via an NMOS sampling switch, to charge the capacitor to the input signal voltage. During an analog-to-digital conversion process, the second capacitor terminal may swing in a voltage range that extends below ground. A controller circuit provides bias voltage signals to a gate terminal and to a p-well of the NMOS sampling switch, to selectively turn the sampling switch on and off. In a first step of a multi-step sampling process, the controller very quickly discharges the gate terminal to ground to isolate a quantity of charge on the second capacitor plate. In a subsequent step of the sampling process, the controller circuit applies a negative voltage to the gate terminal and p-well to ensure that the quantity of change is substantially preserved during the ensuing analog-to-digital conversion process.

US Patent:

20220209681, Jun 30, 2022

Filed:

Dec 30, 2020

Appl. No.:

17/138295

Inventors:

- Limerick, IE
Raymond Thomas Perry - South San Francisco CA, US
Quan Wan - Belmont MA, US
David James Plourde - Pembroke NH, US
Andreas Koch - Wiesbaden, DE
Paul A. Perrault - Cochrane, CA

International Classification:

H02M 7/36
H03K 5/24

Abstract:

A system for processing a signal in a signal chain having decentralized embedded power management of components of the signal chain includes an input circuit to generate a measurement signal responsive to a stimulus, where the measurement signal is indicative of a characteristic of the stimulus. The system additionally includes a signal converter circuit coupled to the input circuit to convert the measurement signal to a digital signal according to a timing condition for capturing a sample of the measurement signal. The signal converter includes a control circuit to provide electrical power to the input circuit based on the timing condition and a sampling circuit to capture the sample of the measurement signal responsive to an indicator signal generated by the sensor circuit.

US Patent:

20150229277, Aug 13, 2015

Filed:

Oct 31, 2014

Appl. No.:

14/530358

Inventors:

- Milpitas CA, US
Raymond T. PERRY - San Francisco CA, US
Guy M. HOOVER - San Jose CA, US

International Classification:

H03F 1/08
H03F 3/45

Abstract:

An operational amplifier circuit reduces signal distortion in switching circuits resulting from flow of bias current through an analog switch having a resistance that changes with a common mode voltage level. The circuit includes an operational amplifier, and first, second, and third switches monolithically integrated on a same integrated circuit substrate. The first switch is connected in a feedback path of the operational amplifier between an output and an inverting input of the operational amplifier. The second and third switches each have one terminal connected to a non-inverting input of the operational amplifier and another terminal receiving a respective input signal, and operate to provide a selected input signal to the amplifier. The first switch operates in a conducting state before, during, and after any period in which any of the second and third switches is in the conducting state. The switches may be analog switches having same operational characteristics.