Claims
- 1. An integrated circuit comprising:a supply voltage terminal; an amplifier circuit comprising at least one transistor having a base terminal configured to receive a base current; and a base current compensation circuit coupled to said supply voltage terminal and said amplifier circuit, said base current compensation circuit configured for compensation of losses in said base current of said at least one transistor through injection of a compensation current at a compensation node coupled to said base terminal. wherein said base current compensation circuit a curent mirror circuit and a sampling circuit wherein said current mirror circuit comprises a pair of transistors, with a first transistor of said pair of transistors comprising a diode-connected transistor and a second transistor of said pair of transistors having a collector coupled to said base terminal, wherein said sampling circuit comprises a first sampling component and a second sampling component, said first sampling component comprising a first transistor having a base terminal coupled to said base terminal of said at least one transistor of said amplifier circuit, and an emitter terminal coupled to an emitter terminal of said at least one transistor of said amplifier circuit, and wherein said second sampling component comprises a second transistor having an emitter coupled to a collector of said second transistor of said current mirror circuit, a base coupled to said base terminal of said amplifier circuit, and a collector coupled to a negative supply voltage terminal.
- 2. The integrated circuit of claim 1, wherein said base current compensation circuit comprises:a current mirror circuit coupled between said supply voltage terminal and said amplifier circuit; and a sampling circuit coupled to said compensation node to inject said compensation current, said sampling circuit comprising a first sampling component and a second sampling component, said first Sampling component configured for sampling collector current of said at least one transistor device of said amplifier circuit, and said second sampling component configured for sampling base current of said at least one transistor device of said amplifier circuit.
- 3. The integrated circuit of claim 1, wherein said base current compensation circuit is configured for providing multiples of said base current that is demanded by said at least one transistor.
- 4. The integrated circuit of claim 3, wherein said base current compensation circuit is configured for providing multiples of said base current through scaling of device areas of transistors within said base compensation circuit and said at least one transistor of said amplifier circuit.
- 5. The integrated circuit of claim 1, wherein said amplifier circuit comprises a differential pair of transistors.
- 6. The integrated circuit of claim 1, wherein said amplifier circuit comprises a logarithmic amplifier circuit.
- 7. The integrated circuit of claim 1, wherein said integrated circuit comprises a plurality of base current compensation circuits.
- 8. An amplifier circuit configured with a base current compensation circuit for reducing losses in the base current of a transistor in said amplifier circuit, said base current compensation circuit comprising:a current mirror circuit coupled to said amplifier circuit; a sampling circuit configured to sample multiples of the base current for injecting a compensation current, said sampling circuit coupled with said current mirror circuit to said amplifier circuit, said sampling circuit comprising a first sampling component and a second sampling component; and a compensation node coupled to a base terminal of the transistor of said amplifier circuit, wherein said base current compensation circuit is configured for compensation of tosses in said base current through injection of said compensation current into said compensation node, wherein said current mirror circuit comprises a first transistor and a second transistor, said first transistor comprising a diode-connected transistor and said second transistor having a collector coupled to a base terminal of said amplifier circuit, wherein said first sampling component comprises a third transistor having a base terminal coupled to said base terminal of the transistor of said amplifier circuit, and an emitter terminal coupled to the emitter terminal of the transistor of said amplifier circuit, wherein said second sampling component comprises a fourth transistor having a collector configured to receive a supply voltage, a base coupled to a collector terminal of said first transistor, and an emitter coupled to a collector of said third transistor, and wherein said second sampling component comprises a fourth transistor having an emitter coupled to said collector of said second transistor, a base coupled to said base terminal of said third transistor, and a collector coupled to a negative supply voltage terminal.
- 9. The amplifier circuit of claim 8, wherein said first sampling component is configured for sampling collector current of the transistor of said amplifier circuit, and said second sampling component is configured for sampling base current of the transistor of said amplilier circuit.
- 10. The amplifier circuit of claim 9, wherein said base current compensation circuit is configured for providing multiples of said base current through scaling of device areas of transistors within said base compensation circuit and said amplifier circuit.
- 11. The amplifier circuit of claim 8, wherein said amplifier circuit comprises a logarithmic amplifier circuit.
- 12. A base current compensation circuit for compensating for losses in base current in a transistor in an amplifier circuit, said base current compensation circuit comprising:a sampling circuit configured to sample multiples of the base current for injecting a compensation current, said sampling circuit comprising a first sampling component for sampling and a second sampling component, said first sampling component configured for sampling collector current of the transistor of the amplifier circuit, and said second sampling component is configured for sampling base current of the transistor of the amplifier circuit; and wherein said base current compensation circuit is configured for compensation of losses in the base current through injection of a compensation current into a compensation node, wherein said first sampling component comprises a first transistor having a base terminal configured for coupling into a base terminal of the transistor of the amplifier circuit, and an emitter terminal configured for coupling into an emitter terminal of the transistor of the amplifier circuit, and wherein said second sampling component comprises a second transistor having a base coupled to a base terminal of said first transistor of said first sampling component, and a collector coupled to a negative supply voltage terminal.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims priority of U.S. Provisional Application No. 60/367,850, filed Mar. 27, 2002, entitled “BASE CURRENT COMPENSATION CIRCUIT.”
US Referenced Citations (8)
Provisional Applications (1)
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Number |
Date |
Country |
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60/367850 |
Mar 2002 |
US |