Carey Todd Ritchey

6462327, Oct 8, 2002

Sep 27, 2001

09/967694

R. William Ezell - Carrollton TX
Carey Ritchey - Plano TX

Microtune (Texas), L.P. - Plano TX

H01J 4014

250214A, 250214 R

Disclosed are systems and methods which provide signal processing circuitry utilizing a variable gain transimpedance amplifier configuration which is economical to implement and which provides for power efficient circuit implementation. Preferred embodiments provide a transimpedance amplifier having an output intercept that remains constant while a corresponding input intercept increases as gain is reduced. An analog optical receiver preferably implements an architecture in which the variable gain transimpedance amplifier is disposed as an input amplifier.

6919774, Jul 19, 2005

Oct 3, 2001

09/970351

Carey Ritchey - Plano TX, US
Tom L. Davis - Carrollton TX, US

Microtune (Texas), L.P. - Plano TX

H03H007/25
H01P001/22

333 81R, 327308, 327325

Diode network configurations are disclosed in which cathode bias voltage is held substantially constant to provide an attenuator circuit in which return loss is optimized throughout a broad dynamic attenuation range. Preferred embodiments include PIN diodes arranged in a π network having two attenuation control signals provided thereto. Alternative embodiments include PIN diodes arranged in a T network having two attenuation control signals provided thereto.

6973288, Dec 6, 2005

Oct 3, 2001

09/970311

Tom L. Davis - Carrollton TX, US
Kim E. Beumer - Richardson TX, US
Carey Ritchey - Plano TX, US

Microtune (Texas), L.P. - Plano TX

H04B017/00

455 6711, 4551692, 4551804

Linearizer circuitry is disclosed for providing control signal outputs to operate a controllable attenuator throughout a relatively large dynamic range while maintaining a relatively consistent return loss. Preferred embodiment linearizer circuitry provides a series control current and a shunt control current for coupling to a PIN diode attenuator, such as may be configured in a π network or a T network. Preferably, differential pairs are utilized in providing each of the control current outputs.

7853227, Dec 14, 2010

May 26, 2006

11/441816

Jan-Michael Stevenson - Frisco TX, US
Jose L. Esquivel - Plano TX, US
Carey Ritchey - Murphy TX, US
Kim E. Beumer - Richardson TX, US

Microtune (Texas), L.P. - Plano TX

H04B 1/06
H04B 7/00

4552321, 4552341, 4552491, 4552511, 375345

A system for providing automatic gain control (AGC) comprises a signal path with an RF input, a plurality of power detectors in communication with the signal path, each of the power detectors operable to measure a total broadband power level of a signal in the signal path, each of the power detectors positioned to monitor a point in the signal path corresponding to a change in signal bandwidth, a control system operable to receive from each of the power detectors information associated with the power level and to adjust attenuation in the signal path in response to the information to achieve desired gain control.

8107918, Jan 31, 2012

Apr 11, 2008

12/101649

Carey Ritchey - Murphy TX, US
Kim E. Beumer - Richardson TX, US
Marius Pop - Richardson TX, US

Zoran Corporation - Sunnyvale CA

H04B 1/10

455308, 455315, 455339, 375229

An agile RF tuner circuit capable of converting a wide portion of RF signal into an IF signal suitable for analog-to-digital conversion. The circuit up converts a received RF signal to a high IF signal and then down converts the high IF signal to a low IF signal. Embodiments of the RF circuit incorporate harmonic reject mixers to suppress harmonies and intermodulations typically associated with the frequency conversion process.

8422978, Apr 16, 2013

Dec 29, 2011

13/339560

Carey Ritchey - Murphy TX, US
Kim E. Beumer - Richardson TX, US
Marius Pop - Richardson TX, US

CSR Technology Inc. - Sunnyvale CA

H04B 1/26

455323, 455308, 455339

An agile RF tuner circuit capable of converting a wide portion of RF signal into an IF signal suitable for analog-to-digital conversion. The circuit up converts a received RF signal to a high IF signal and then down converts the high IF signal to a low IF signal. Embodiments of the RF circuit incorporate harmonic reject mixers to suppress harmonics and intermodulations typically associated with the frequency conversion process.

8442471, May 14, 2013

Dec 29, 2011

13/339549

Carey Ritchey - Murphy TX, US
Kim E. Beumer - Richardson TX, US
Marius Pop - Richardson TX, US

CSR Technology Inc. - Sunnyvale CA

H04B 1/10

455308, 455315, 455339, 375229

An agile RF tuner circuit capable of converting a wide portion of RF signal into an IF signal suitable for analog-to-digital conversion. The circuit up converts a received RF signal to a high IF signal and then down converts the high IF signal to a low IF signal. Embodiments of the RF circuit incorporate harmonic reject mixers to suppress harmonics and intermodulations typically associated with the frequency conversion process.