US 11,152,899 B2Granted

Multi-stage amplifier including a pre-driver stage

AssigneeTexas Instruments Incorporated

InventorRavpreet Singh

Life of this patent

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Abstract

A multi-stage amplifier including a pre-driver stage, and method of operating the same. In one example, the amplifier includes an output stage with a first output transistor coupled to an oppositely doped second output transistor and to an output terminal. The pre-driver stage includes with a first driver transistor coupled to the first output transistor, and a second driver transistor coupled to the second output transistor. The pre-driver stage also includes a first current mirror and a second current mirror coupled to the first driver transistor and the second driver transistor. The pre-driver stage also includes a first translinear loop having a first translinear loop transistor and a second translinear loop having a second translinear loop transistor coupled to the first output transistor and the second output transistor.

Claims17

Dependent claims

An amplifier, comprising:

an output stage including a first output transistor having a collector coupled to a collector of an oppositely doped second output transistor and to an output terminal;
and
a pre-driver stage, including:
a first driver transistor having an emitter coupled to a base of the first output transistor,
a second driver transistor having an emitter coupled to a base of the second output transistor;
a first current mirror including a first current sensing branch coupled to a collector of the second driver transistor and a first current output branch coupled to an emitter of the first driver transistor,
a second current mirror including a second current sensing branch coupled to a collector of the first driver transistor and a second current output branch coupled to an emitter of the second driver transistor,
a first translinear loop including:
a first translinear loop transistor with an emitter coupled to the base of the first output transistor and a collector coupled to the base of the second output transistor,
a first series diode pair coupled between a first power supply bus and a base of the first translinear loop transistor, and
a second series diode pair coupled between the base of the first translinear loop transistor and a second power supply bus, and
a second translinear loop including:
a second translinear loop transistor with an emitter coupled to the base of the second output transistor and a collector coupled to the base of the first output transistor,
a third series diode pair coupled between the second power supply bus and a base of the second translinear loop transistor, and
a fourth series diode pair coupled between the base of the second translinear loop transistor and the first power supply bus.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/601,655Filed 15 Oct 2019
Published: US 2021/0111677 A115 Apr 2021
Granted: 19 Oct 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H03F 3/211
With semiconductor devices only: using a combination of several amplifiers
H03F 3/245
Of transmitter output stages: with semiconductor devices only
H03F 3/3076
The emitters of complementary power transistors being connected to the output: with symmetrical driving of the end stage
H03F 3/3432
With semiconductor devices only: with bipolar transistors