Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1996-11-01
1999-01-05
Wells, Kenneth B.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 89, 327513, 327563, 330253, 323316, H03K 522
Patent
active
058567496
ABSTRACT:
A CMOS output circuit including a differential error amplifier (3) is operated to provide a stable quiescent bias current in an output MOSFET by causing a first current equal to a threshold voltage of a P-channel reference MOSFET (M1) divided by the resistance of a reference resistor (R1) to flow through an N-channel current mirror control MOSFET (M4). A first N-channel current mirror output MOSFET (M6) having a gate coupled to the gate of the N-channel current mirror control MOSFET (M4) and a drain coupled to a drain of the P-channel reference MOSFET (M1) causes a second current proportional to the first current to flow through the P-channel reference MOSFET (M1). The first current is controlled in response to feedback from the P-channel reference MOSFET (M1). A bias current in an error amplifier (3) is controlled in response to the N-channel current mirror control MOSFET (M4). The bias current in the error amplifier and the resistances of first (R2) and second (R3) resistive load devices of the error amplifier are scaled to produce a drive voltage which applies a gate-to-source quiescent bias voltage to a P-channel pull-up MOSFET (M11) which is substantially equal to and tracks with the gate-to-source voltage of the reference MOSFET (M1).
REFERENCES:
patent: 4284957 (1981-08-01), Haque
patent: 4333058 (1982-06-01), Hoover
patent: 4335355 (1982-06-01), Haque
patent: 4383223 (1983-05-01), Ulmer
patent: 4480230 (1984-10-01), Brehmer et al.
patent: 4484148 (1984-11-01), Wieser et al.
patent: 4656436 (1987-04-01), Saari
patent: 4897612 (1990-01-01), Carroll
patent: 4912425 (1990-03-01), Kobayashi et al.
patent: 5162753 (1992-11-01), Khorramahadi
patent: 5220288 (1993-06-01), Brooks
patent: 5287070 (1994-02-01), Thelen et al.
patent: 5363059 (1994-11-01), Thiel
patent: 5446412 (1995-08-01), Kimyacioglu et al.
patent: 5491448 (1996-02-01), Naokawa et al.
patent: 5500624 (1996-03-01), Anderson
patent: 5515006 (1996-05-01), Chan
patent: 5596289 (1997-01-01), Liu
Burr-Brown Corporation
Wells Kenneth B.
LandOfFree
Stable output bias current circuitry and method for low-impedanc does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stable output bias current circuitry and method for low-impedanc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stable output bias current circuitry and method for low-impedanc will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-865556