| 5812658 |
Method and circuit for failsafe switch-hook detection during fault in a telephone system |
Donald K. Whitney |
1998-09-22 |
| 5671272 |
Current mode ring trip detector |
— |
1997-09-23 |
| 5659570 |
Circuit and method for loopback test and on-hook transmission integrated in a telephone subscriber line interface circuit |
Christopher Ludeman, Donald K. Whitney |
1997-08-19 |
| 5614867 |
Current follower with zero input impedance |
— |
1997-03-25 |
| 5572162 |
Filter with reduced element ratings and method |
— |
1996-11-05 |
| 5517565 |
Integrated ringer relay circuit and method |
— |
1996-05-14 |
| 5515417 |
Ground key detector for a SLIC |
— |
1996-05-07 |
| 5515434 |
Impedance setting circuit for a SLIC |
— |
1996-05-07 |
| 5471131 |
Analog-to-digital converter and reference voltage circuitry |
Ken King, David W. Riemer |
1995-11-28 |
| 5382916 |
Differential voltage follower |
Ken King, David W. Riemer |
1995-01-17 |
| 4891604 |
High speed low input current voltage follower stage |
— |
1990-01-02 |
| 4879520 |
High accuracy current source and high accuracy transconductance stage |
— |
1989-11-07 |
| 4879523 |
High accuracy, high impedance differential to single-ended current converter |
— |
1989-11-07 |
| 4783637 |
Front end stage of an operational amplifier |
— |
1988-11-08 |
| 4636743 |
Front end stage of an operational amplifier |
— |
1987-01-13 |
| 4560948 |
Circuit for increasing voltage gain |
John S. Prentice |
1985-12-24 |
