Stephen B Venzke

6876241, Apr 5, 2005

Jul 31, 2003

10/631703

William H. Coley - Longmont CO, US
Stephen B. Venzke - Loveland CO, US

Agilent Technologies, Inc. - Palo Alto CA

H03K003/00

327291, 327112

A low voltage source of input edges is AC coupled to positive and negative edge differentiators. Each differentiator briefly drives ON a corresponding normally OFF switch, the pair of which switches serves as an impulse driver and that may be clamped to symmetrical opposing reference voltages. The bi-stable switch driver responds to a particular polarity impulse driver voltage by applying thereto through a load resistor a percentage of a power supply voltage of opposite polarity. The impulse driver is also coupled to a complementary pair of MOSFET switches that are in series between precise reference voltages of opposing polarities, and whose common junction may be connected to a current determining resistance. The output of the MOSFET switches may be assisted by an auxiliary bi-stable output driver that reduces the amount of load current drawn from those MOSFETS.

7081805, Jul 25, 2006

Feb 10, 2004

10/775631

Stephen Bolin Venzke - Loveland CO, US

Agilent Technologies, Inc. - Palo Alto CA

H01C 1/02

338260, 338320

A thermally stabilized device is described. Single or multiple input ports are accommodated and single and multiple power ports are described. The variation of resistance of a resistor subject to varying power dissipations is minimized by injecting complementary power dissipation and thermally linking it to the resistor. In this manner the temperature of a resistor may be maintained constant even though it dissipates varying amounts of power.

7423514, Sep 9, 2008

Jun 2, 2006

11/446310

Stephen Bolin Venzke - Loveland CO, US

Agilent Technologies, Inc. - Santa Clara CA

H01C 1/02

338260, 338 23, 338319, 333 81 R, 361766

A thermally stabilized device is described. Single or multiple input ports are accommodated and single and multiple power ports are described. The variation of resistance of a resistor subject to varying power dissipations is minimized by injecting complementary power dissipation and thermally linking it to the resistor. In this manner the temperature of a resistor may be maintained constant even though it dissipates varying amounts of power.

7262663, Aug 28, 2007

Oct 26, 2005

11/259507

William H. Coley - Longmont CO, US
Stephen B. Venzke - Loveland CO, US

Agilent Technologies, Inc. - Santa Clara CA

H03F 3/45

330259, 330297

The output of a commercially available integrated high gain differential amplifier that already has reasonable linearity is connected back to the (−) input to obtain the well known circuit configuration for a non-inverting amplifier, whose gain may be unity or greater, and whose linearity in response to the (+) input is to be improved. We operate the part with power supplies that are dynamically varied to always be the amplifier input+N volts and that input−N volts. This allows the part to remain a low voltage swing part (N volts) even though the actual output might swing several times that N volts. It improves linearity because the part is almost always operating at nearly ‘the same operating point’ relative to the perceived power supplies. The dynamically tracking power supplies maybe obtained from plus and minus higher voltage work supplies and the use of symmetrical current mirrors to produce matched N volt offsets that are referenced to the input of the amplifier.

20050104645, May 19, 2005

Dec 16, 2004

11/014647

William Coley - Longmont CO, US
Stephen Venzke - Loveland CO, US

G06F001/04

327291000

A low voltage source of input edges for a pulse of precision duration is applied to an input buffer to provide a low impedance source whose output is AC coupled to positive and negative edge differentiators. Each differentiator briefly drives ON a corresponding normally OFF switch, the pair of which switches serves as an impulse driver and that may be clamped to symmetrical opposing reference voltages. The clamped impulse driver may also be coupled to a bi-stable switch driver that responds to a particular polarity impulse driver voltage by applying thereto through a load resistor a percentage of a power supply voltage of opposite polarity. The bi-stable switch driver changes state each time input edges of alternating polarity are applied to the input buffer. The impulse driver is also coupled to the gates of a complementary pair of MOSFET switches that are in series between precise reference voltages of opposing polarities, and whose common junction may be connected to a current determining resistance whose other end is connected to a using circuit, such as an integrator. The output of the MOSFET switches may be assisted by an auxiliary bi-stable output driver that reduces the amount of load current drawn from those MOSFETs, and thereby reduces errors arising from thermally induced variations in their on resistance.

41278119, Nov 28, 1978

Sep 3, 1976

5/720486

Albert B. Gookin - Loveland CO
Vernal D. Forbes - Loveland CO
Stephen B. Venzke - Loveland CO

Hewlett-Packard Company - Palo Alto CA

G01R 102
G01R 1706

324130

A voltmeter having multiple voltage ranges comprises substantially linear elements such that the transfer functions of the elements can be independently measured and logically combined to derive the transfer function of a given combination of elements configured to obtain a given voltage range.