Claims
- 1. An operational amplifier comprising:
an input stage comprising a first plurality of metal-oxide semiconductor field-effect transistors electrically connected in a double-cascode telescopic operational amplifier configuration; a positive input electrically connected to the input stage; a negative input electrically connected to the input stage; a first series circuit comprising a first coupling resistor and a first coupling capacitor electrically connected to the input stage; a second series circuit comprising a second coupling resistor and a second coupling capacitor electrically connected to the input stage; an output stage electrically connected to the first series circuit and to the second series circuit comprising a second plurality of metal-oxide semiconductor field-effect transistors electrically connected in a fully-differential operational amplifier configuration; a positive output electrically connected to the output stage, wherein a first load capacitor is electrically connected to the positive output; a negative output electrically connected to the output stage, wherein a second load capacitor is electrically connected to the negative output; a first plurality of bias inputs electrically connected to the input stage; and a second plurality of bias inputs electrically connected to the input and output stages.
- 2. An operational amplifier comprising:
an input stage comprising a first plurality of metal-oxide semiconductor field-effect transistors electrically connected in a double-cascode telescopic operational amplifier configuration; an output stage electrically coupled to the input stage and comprising a second plurality of metal-oxide semiconductor field-effect transistors electrically connected in a fully-differential operational amplifier configuration;
- 3. The operational amplifier of claim 2 wherein the output stage is electrically coupled to the input stage by a first circuit comprising a first coupling resistor and a first coupling capacitor and by a second circuit comprising a second coupling resistor and a second coupling capacitor.
- 4. The operational amplifier of claim 2 wherein a positive input and a negative input are electrically connected to the input stage, a positive output having a first load capacitor and a negative output having a second load capacitor are electrically connected to the output stage, a first plurality of bias inputs are electrically connected to the input stage, and a second plurality of bias inputs are electrically connected to the input stage and the output stage.
- 5. An operational amplifier comprising:
means for receiving and amplifying a signal; means for amplifying and outputting the signal received and amplified by the receiving and amplifying means.
- 6. The operational amplifier of claim 7, further comprising means for electrically coupling the receiving and amplifying means to the amplifying and outputting means.
- 7. A method for providing an operational amplifier having a very high open-loop DC gain, a very high unity-gain frequency, and a relatively very low power consumption comprising the steps of:
providing an input stage having very high gain, high input resistance, and large common mode rejection and comprising a first plurality of metal-oxide semiconductor field-effect transistors configured in a double-cascode telescopic operational amplifier configuration; and providing an output stage electrically coupled to the input stage having gain, low output resistance, and a minimal output loss characteristic and comprising a second plurality of metal-oxide semiconductor field-effect transistors configured in a fully-differential operational amplifier configuration.
- 8. The method of claim 7, further comprising the step of coupling the output stage to the input stage through a first circuit comprising a first coupling resistor and a first coupling capacitor and through a second circuit comprising a second coupling resistor and a second coupling capacitor.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] The present application claims the benefit of co-pending U.S. provisional patent application, issued serial No. 60/224,601, and filed Aug. 11, 2000, which is hereby incorporated by reference in its entirety.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60224601 |
Aug 2000 |
US |
Continuations (1)
|
Number |
Date |
Country |
Parent |
09747470 |
Dec 2000 |
US |
Child |
10198848 |
Jul 2002 |
US |