1
Stephen T Sparks: Amplitude control system having parallel integrating signal paths. Hewlett Packard Company, John L Imperato, August 26, 1997: US05661442 (11 worldwide citation)

An amplitude control system uses a pair of parallel integrators to rapidly adjust the amplitude of a test signal between two precisely determined power levels in an RF signal generator. The amplitude control system initializes a first power level by switching a first integrator into a feedback signa ...


2
Joel P Dunsmore, Berry Carone, Stephen T Sparks: System and method for generating balanced modulated signals with arbitrary amplitude and phase control using modulation. Agilent Technologies, July 27, 2004: US06768390 (7 worldwide citation)

Modulated differential (balanced) drive signals are created where, at least one of the signals can be controlled in phase relative to the other, and both of which could be controlled in amplitude and both of which have the same modulation envelope. In one embodiment, a coherent signal is generated i ...


3
Stephen T Sparks, John R Regazzi: Remote calibrated power source system and method. Hewlett Packard Company, Patrick J Barrett, William C Milks III, March 22, 1988: US04733234 (4 worldwide citation)

A remote calibrated power source system comprises an instrument for generating power, the instrument being positioned at a first location, and a remote calibrated power source module for outputting calibrated power, the remote module being positioned at a second location that is removed from the fir ...


4
Kenneth D Poulton, Stephen T Sparks: Discrete synthesis using staggered Nyquist regions avoids guard band induced holes near a Nyquist limit. Agilent Technologies, May 20, 2008: US07375667 (2 worldwide citation)

Staggered consecutive Nyquist regions associated with differing DAC synthesizer clock rates (FCLK) avoids spectrum lost through disjoint guard bands at the end of or between adjacent Nyquist regions. The staggered consecutive Nyquist regions overlap by an amount at least as much as is consumed by th ...


5
Paul A Lameiro, Michal B Krombholz, Michael S Foster, Jeffrey E Nelson, Stephen T Sparks: Method and signal control system providing fast transitions in an oscillating signal. Agilent Technolgies, March 2, 2010: US07671690

In one embodiment, a signal control system has a signal output and includes: 1) a phase-locked loop (PLL) having a voltage-controlled oscillator (VCO), a phase error detector, an oscillating output coupled to the signal output of the signal control system, and a programmable frequency divider couple ...


6
Stephen T Sparks: Heterodyne system. Agilent Technologies, Legal Department DL429, March 10, 2005: US20050054310-A1

A heterodyne system provides a first signal and a second signal in response to a received drive signal, wherein the frequency of the first signal divided by the frequency of the second signal is an integer ratio. A mixer receives the first signal and the second signal and provides a series of mixing ...


7
Kenneth D Poulton, Stephen T Sparks: Discrete Synthesis Using Staggered Nyquist Regions Avoids Guard Band Induced Holes Near a Nyquist Limit. Agilent Technologies, March 20, 2008: US20080068244-A1

Staggered consecutive Nyquist regions associated with differing DAC synthesizer clock rates (FCLK) avoids spectrum lost through disjoint guard bands at the end of or between adjacent Nyquist regions. The staggered consecutive Nyquist regions overlap by an amount at least as much as is consumed by th ...


8
Paul A Lameiro, Michal B Krombholz, Michael S Foster, Jeffrey E Nelson, Stephen T Sparks: Method and signal control system providing fast transitions in an oscillating signal. Agilent Technologies, March 5, 2009: US20090058548-A1

In one embodiment, a signal control system has a signal output and includes: 1) a phase-locked loop (PLL) having a voltage-controlled oscillator (VCO), a phase error detector, an oscillating output coupled to the signal output of the signal control system, and a programmable frequency divider couple ...