| Patent Number |
Title Of Patent |
Date Issued |
| 7352166 |
Resistance ratio digitizing ohmmeter system |
April 1, 2008 |
| A digitizing ohmmeter system for providing a digital resistance ratio measurement includes a high impedance current source providing a DC excitation current to an impedance-varying input sensor and a reference resistor and an ADC circuit including a charge-balancing modulator and a d |
| 7331708 |
Frequency ratio digitizing temperature sensor with linearity correction |
February 19, 2008 |
| A frequency ratio digitizing temperature sensor for generating a linearity-corrected temperature output signal includes an input generation circuit receiving a PTAT current and a CTAT current and a frequency ratio ADC including data and reference oscillators. The input generation cir |
| 6975103 |
Resistance ratio digitizing ohmmeter system |
December 13, 2005 |
| A digitizing ohmmeter system for providing a digital resistance ratio measurement includes a high impedance current source providing a DC excitation current to an impedance-varying input sensor and a reference resistor and an ADC circuit including a charge-balancing modulator and a d |
| 6962436 |
Digitizing temperature measurement system and method of operation |
November 8, 2005 |
| A digitizing temperature measurement system for providing a digital temperature measurement includes an excitation source for providing switched excitation currents to two or three temperature sensing elements and an ADC circuit including a charge-balancing modulator and a digital po |
| 6930495 |
Digitizing ohmmeter system |
August 16, 2005 |
| A digitizing ohmmeter system for providing a digital resistance measurement includes a current source for providing an excitation current to an impedance-varying input sensor and an ADC circuit including a charge-balancing modulator and a digital post processing circuit. The system u |
| 6903558 |
Digitizing ohmmeter system |
June 7, 2005 |
| A digitizing ohmmeter system for providing a digital resistance measurement includes a current source for providing an excitation current to an impedance-varying input sensor and an ADC circuit including a charge-balancing modulator and a digital post processing circuit. The system u |
| 6869216 |
Digitizing temperature measurement system |
March 22, 2005 |
| A digitizing temperature measurement system for providing a digital temperature measurement includes an excitation source for providing switched excitation currents to two or three temperature sensing elements and an ADC circuit including a charge-balancing modulator and a digital po |
| 6831504 |
Constant temperature coefficient self-regulating CMOS current source |
December 14, 2004 |
| A current source includes a first circuit branch of a pair of diode-connected transistors with a resistor connected at the drain terminal and a second circuit branch of an inverter pair of transistors. Both of the circuit branches are supplied by a first current source powered by a s |
| 6750796 |
Low noise correlated double sampling modulation system |
June 15, 2004 |
| A charge balancing modulation system for digitizing the output of a variable impedance sensor utilizes synchronous excitation of the input sensor and AC coupling of the analog input signal. The modulation system also implements correlated double sampling to provide low noise and highly |
| 6374379 |
Low-cost configuration for monitoring and controlling parametric measurement units in automatic |
April 16, 2002 |
| Pin slice circuitry used in automatic test equipment is disclosed. The pin slice circuitry includes a portion implemented using CMOS technology and a portion implemented using bipolar technology. The CMOS portion includes a plurality of timing generator circuits, digital sigma delta modu |
| 6282682 |
Automatic test equipment using sigma delta modulation to create reference levels |
August 28, 2001 |
| Pin slice circuitry used in automatic test equipment is disclosed. The pin slice circuitry includes a portion implemented using CMOS technology and a portion implemented using bipolar technology. The CMOS portion includes a plurality of timing generator circuits and sigma delta modulator |
