# US 8,543,072 B1 · High accuracy programmable gain amplifier

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- Number: US 8,543,072 B1
- Document ID: US8543072B1
- Status: Granted
- Kind: B1
- Application number: 13/336,499
- Filed: 2011-12-23
- Granted: 2013-09-24
- Earliest claimed: 2007-09-11
- Assignees: Marvell International Ltd.
- Applicants: Nir Yahav
- Inventors: Nir Yahav
- Web page: https://patentgrep.com/patent/US8543072B1

## CPC

- H03F 3/45188: {Non-folded cascode stages}
- H03F 3/245: {with semiconductor devices only}
- H03G 3/001: {Digital control of analog signals}
- H03F 2203/45311: the common gate stage of a cascode dif amp being implemented by multiple transistors
- H03F 2203/45466: the CSC being controlled, e.g. by a signal derived from a non specified place in the dif amp circuit
- H04B 2001/0416: {having gain or transmission power control}
- H03F: AMPLIFIERS
- H03G: CONTROL OF AMPLIFICATION
- H04B: TRANSMISSION

## Abstract

A high accuracy programmable gain amplifier has reduced temperature dependency, reduced supply voltage dependency, and supports accurate amplifier gain and accurate amplifier gain steps. The high accuracy programmable gain amplifier allows requirements compliant electronic devices to be fabricated that are capable of providing improved operational performance with less power consumption, hence extended battery life and improved operational availability. Electronic devices that incorporate the high accuracy programmable gain amplifier described below, may experience reduced variations in operational performance resulting in a reduced need for post production calibration, reduced calibration data storage requirements, and reduced device control processor cycles for use in performing calibration operations, thereby allowing such devices to be produced at a lower cost and/or to provide users with increased operational performance and/or increased battery life and, hence, increased operational availability.

## Claims

### Claim 1

A method for transmitting a message in a mobile communication device, comprising:
receiving a power indication from a network;
providing an instruction based on the power indication to an amplifier having a plurality of transistors, the instruction being defined by a plurality of control bits that are generated by a logic circuit coupled with the amplifier;
programmably loading the amplifier in response to the instruction so that a first group of the plurality of transistors is placed in a CLOSED state by a first output of the logic circuit; and
transmitting the message at a programmed power.

### Claim 2 (depends on 1)

The method of claim 1, wherein the instruction controls a gain of the transmitted message.

### Claim 3 (depends on 1)

The method of claim 1, wherein the instruction controls switching of the plurality of transistors.

### Claim 4 (depends on 1)

The method of claim 1, wherein a second group of the plurality of transistors is placed in a CLOSED state by a second output of the logic circuit.

### Claim 5 (depends on 4)

The method of claim 4, wherein the number of transistors in the first group is the same as the number of transistors in the second group.

### Claim 6 (depends on 1)

The method of claim 1, further comprising:
supplying a constant current to the amplifier.

### Claim 7 (depends on 1)

The method of claim 1, further comprising:
supplying a variable current to the amplifier.

### Claim 8 (depends on 7)

The method of claim 7, wherein controlling the variable current sets the amplifier to a working point.

### Claim 9

A mobile communication device in a network, comprising:
a receiver configured to receive a power indication from the network;
an amplifier configured to provide an instruction based on the power indication to a plurality of transistors in the amplifier to programmably load the amplifier, the instruction being defined by a plurality of control bits that are generated by a logic circuit coupled with the amplifier, and causing a first group of the plurality of transistors to be in a CLOSED state, when the output of the logic circuit is a first output; and
a transmitter configured to transmit a message at a programmed power.

### Claim 10 (depends on 9)

The mobile communication device of claim 9, wherein the instruction controls a gain of the transmitted message.

### Claim 11 (depends on 9)

The mobile communication device of claim 9, wherein the instruction controls switching of the plurality of transistors.

### Claim 12 (depends on 9)

The mobile communication device of claim 9, wherein a second group of the transistors is placed in a CLOSED state by a second output of the logic circuit.

### Claim 13 (depends on 12)

The mobile communication device of claim 12, wherein the number of transistors in the first group is the same as the number of transistors in the second group.

### Claim 14 (depends on 9)

The mobile communication device of claim 9, further comprising:
a constant current source configured to supply a constant current to the amplifier.

### Claim 15 (depends on 9)

The mobile communication device of claim 9, further comprising:
a variable current source configured to supply a variable current to the amplifier.

### Claim 16 (depends on 15)

The mobile communication device of claim 15, wherein controlling the variable current source sets the amplifier to a working point.