Method and system for minimizing differential amplifier power supply sensitivity
First Claim
1. An apparatus for minimizing power supply sensitivity of a differential amplifier, comprising:
- a current source providing a differential amplifier bias current to a common source node of the differential amplifier, the current source comprising a current mirror, the current mirror comprising an amplifier bias current transistor;
a voltage sensor for sensing variations of a power supply associated with the current source;
wherein variations sensed by the voltage sensor control a magnitude of the differential amplifier bias current by adjusting a back gate bias of the amplifier bias current transistor.
3 Assignments
0 Petitions
Accused Products
Abstract
The invention includes an apparatus and a method for minimizing power supply sensitivity of a differential amplifier. The apparatus includes a current source providing a differential amplifier bias current to a common source node of the differential amplifier. A voltage sensor senses variations of a power supply associated with the current source. Variations sensed by the voltage sensor control a magnitude of the differential amplifier bias current. The method includes a current source providing the source current. A voltage potential of the common source node is sensed. The current source is adjusted depending upon the sensed voltage potential of the common source node, thereby adjusting a magnitude of the source current.
34 Citations
12 Claims
-
1. An apparatus for minimizing power supply sensitivity of a differential amplifier, comprising:
-
a current source providing a differential amplifier bias current to a common source node of the differential amplifier, the current source comprising a current mirror, the current mirror comprising an amplifier bias current transistor;
a voltage sensor for sensing variations of a power supply associated with the current source;
whereinvariations sensed by the voltage sensor control a magnitude of the differential amplifier bias current by adjusting a back gate bias of the amplifier bias current transistor. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. An apparatus for minimizing power supply sensitivity of a differential amplifier, comprising:
-
a current mirror providing a differential amplifier bias current to a common source node of the differential amplifier, the current mirror comprising an amplifier bias current transistor and a mirror transistor, the amplifier bias current transistor providing the differential amplifier bias current and the mirror transistor providing a mirror bias current;
a voltage sensor for sensing variations of a power supply associated with the current source;
whereinvariations sensed by the voltage sensor control a magnitude of the differential amplifier bias current by adjusting a magnitude of the mirror bias current by adjusting a back gate bias of the amplifier bias current transistor. - View Dependent Claims (8)
-
-
9. An apparatus for minimizing power supply sensitivity of a differential amplifier, comprising:
-
a current mirror providing a differential amplifier bias current to a common source node of the differential amplifier, the current mirror comprising an amplifier bias current transistor and a mirror transistor, the amplifier bias current transistor providing the differential amplifier bias current and the mirror transistor providing a mirror bias current;
a voltage sensor for sensing variations of a power supply associated with the current source;
whereinvariations sensed by the voltage sensor control a magnitude of the differential amplifier bias current by adjusting a back gate bias of at least one of the amplifier bias current transistor and the mirror transistor.
-
-
10. An apparatus for minimizing power supply sensitivity of a differential amplifier, comprising:
-
a current source providing a differential amplifier bias current to a common source node of the differential amplifier, the current source comprising a current mirror, the current mirror comprising an amplifier bias current transistor and mirror transistor;
a voltage sensor for sensing variations of a power supply associated with the current source;
whereinvariations sensed by the voltage sensor control a magnitude of the differential amplifier bias current by adjusting a back gate bias of the mirror transistor.
-
-
11. An apparatus for minimizing power supply sensitivity of a differential amplifier, comprising:
-
a current source providing a differential amplifier bias current to a common source node of the differential amplifier, the current source comprising a current mirror, the current mirror comprising an amplifier bias current transistor and mirror transistor, the amplifier bias current transistor comprising a plurality of sub-bias current transistors;
a voltage sensor for sensing variations of a power supply associated with the current source;
whereinvariations sensed by the voltage sensor control a magnitude of the differential amplifier bias current by controlling an inclusion of a number of parallel sub-bias current transistors, wherein each included sub-bias current transistors contributes to the differential amplifier bias current.
-
-
12. An apparatus for minimizing power supply sensitivity of a differential amplifier, comprising:
-
a current source providing a differential amplifier bias current to a common source node of the differential amplifier, the current source comprising a current mirror, the current mirror comprising an amplifier bias current transistor and mirror transistor, the amplifier bias current transistor comprises a parallel bias current transistor;
a voltage sensor for sensing variations of a power supply associated with the current source;
wherein variations sensed by the voltage sensor control a magnitude of the differential amplifier bias current by adjusting a bias of the parallel bias current transistor, wherein the parallel bias current transistor contributes to the differential amplifier bias current.
-
Specification