# US 2013/0156140 A1 · Receiver Chain Gain Selection

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- Number: US 2013/0156140 A1
- Document ID: US20130156140A1
- Status: Published application
- Kind: A1
- Application number: 13/326,248
- Filed: 2011-12-14
- Published: 2013-06-20
- Earliest claimed: 2011-12-14
- Assignees: Posedge Inc.
- Inventors: Sujai Chari; Ssu-Pin Ma
- Web page: https://patentgrep.com/patent/US20130156140A1

## CPC

- H03G 3/3068: {Circuits generating control signals for both R.F. and I.F. stages}
- H04B 2001/1054: {by changing bandwidth}
- H03G: CONTROL OF AMPLIFICATION
- H04B: TRANSMISSION

## Abstract

Apparatuses, methods and systems of selecting a gain setting of a receiver chain are disclosed. One method includes bypassing a filter portion of the receiver chain and sampling a bypass receive signal while the filter portion of the receiver chain is bypassed. If the sampled bypass receive signal is determined to be saturated greater than a threshold, then selecting a gain setting of the receive chain as a function of the saturation. Further, the filter portion of the receive chain is included while sampling a receive signal with the selected gain setting.

## Claims

### Claim 1

A method of selecting a gain setting of a receiver chain, comprising:
bypassing a filter portion of the receiver chain;
sampling a bypass receive signal while the filter portion of the receiver chain is bypassed;
if the sampled bypass receive signal is determined to be saturated greater than a threshold, then selecting a gain setting of the receive chain as a function of the saturation; and
including the filter portion of the receive chain and sampling a receive signal with the selected gain setting.

### Claim 2 (depends on 1)

The method of claim 1, wherein the receiver chain includes an I channel and a Q channel, and wherein sampling the bypass receive signal while the filter portion of the receiver chain is bypassed comprises sampling a one of the I channel and the Q channel while a filter portion of the one of the I channel and the Q channel is bypassed.

### Claim 3 (depends on 1)

The method of claim 1, wherein a receive signal of the receiver chain includes packets, and the gain setting of the receiver chain is selected once per packet of the receive signal.

### Claim 4 (depends on 1)

The method of claim 1, wherein selecting the gain setting of the receive chain as a function of the saturation comprises referencing a look-up-table with a saturation value, wherein the look-up-table provides the gain setting.

### Claim 5 (depends on 2)

The method of claim 2, further comprising sampling another one of the I channel and the Q channel that is not bypassed while a filter portion of the other one of the I channel and the Q channel is bypassed.

### Claim 6 (depends on 5)

The method of claim 5, further comprising selecting a second gain setting of the receive chain as a function of the sampled I channel and the sampled Q channel.

### Claim 7 (depends on 6)

The method of claim 6, wherein selecting the second gain setting of the receive chain comprises referencing a look-up-table with the sampled I channel and the sampled Q channel, wherein the look-up-table provides the second gain setting.

### Claim 8 (depends on 1)

The method of claim 1, wherein a receiver analog-to-digital-converter (ADC) performs sampling of the bypass receive signal and sampling of the receive signal.

### Claim 9 (depends on 2)

The method of claim 2, wherein the receiver chain comprises a multiplexer that receives inputs from the I channel, the Q channel, at least one of a bypassed I channel and a bypassed Q channel, and the sampling of the I channel, the Q channel, and the at least one of the bypassed I channel and the bypassed Q channel is controlled by the multiplexer.

### Claim 10 (depends on 1)

The method of claim 1, further comprising selecting a gain of a second receiver chain of a multiple receiver chain receiver based on the sampling a bypass receive signal.

### Claim 11 (depends on 10)

The method of claim 10, further comprising the multiple chain receiver establishing a level of correlation between a receive signal of the receiver chain and a receive signal of the second receiver chain, and if the level of correlation is above a threshold, then using the sampled bypass receive signal and samples of a non-bypass signal of the second receiver chain to set gains of both the receiver chain and the second receiver chain.

### Claim 12 (depends on 1)

The method of claim 1, wherein selecting a gain setting of the receive chain comprises selecting a gain of a low noise amplifier (LNA) of the receive chain and selecting a gain of a variable gain adjust (VGA) of the receive chain.

### Claim 13 (depends on 2)

The method of claim 2, further comprising selecting a digital filtering of the sampled one of the I channel and the Q channel prior to decimation based at least in part on a ratio of powers of the I channel and the Q channel.

### Claim 14 (depends on 5)

The method of claim 5, further comprising determining an amount of interference suppression required after sampling based at least in part on the sampled I channel and the sampled Q channel while a filter portion of the receiver chain is bypassed.

### Claim 15

A receiver, comprising:
a receiver chain, the receiver chain comprising;
a filter portion;
a receiver sampler;
a controller operative to control bypassing of the filter portion, and receiving samples of the receiver sampler, wherein if a sampled receive signal while the filter portion is bypassed is determined to be saturated greater than a threshold, then selecting a gain setting of the receive chain as a function of the saturation;
the controller further operative to including the filter portion of the receive chain and set receiver chain to the selected gain setting for receiving a receive signal.

### Claim 16 (depends on 15)

The receiver of claim 15, wherein the receiver chain includes an I channel and a Q channel, and wherein sampling the bypass receive signal while the filter portion of the receiver chain is bypassed comprises sampling a one of the I channel and the Q channel while a filter portion of the one of the I channel and the Q channel is bypassed.

### Claim 17 (depends on 15)

The receiver of claim 15, wherein a receive signal of the receiver chain includes packets, and the gain setting of the receiver chain is selected once per packet of the receive signal.

### Claim 18 (depends on 15)

The receiver of claim 15, wherein selecting the gain setting of the receive chain as a function of the saturation comprises referencing a look-up-table with a saturation value, wherein the look-up-table provides the gain setting.

### Claim 19 (depends on 16)

The receiver of claim 16, further comprising sampling another one of the I channel and the Q channel that is not bypassed while a filter portion of the other one of the I channel and the Q channel is bypassed.

### Claim 20 (depends on 19)

The receiver of claim 19, further comprising selecting a second gain setting of the receive chain as a function of the sampled I channel and the sampled Q channel.

### Claim 21 (depends on 20)

The receiver of claim 20, wherein selecting the second gain setting of the receive chain comprises referencing a look-up-table with the sampled I channel and the sampled Q channel, wherein the look-up-table provides the second gain setting.

### Claim 22 (depends on 16)

The receiver of claim 16, wherein the receiver chain comprises a multiplexer that receives inputs from the I channel, the Q channel, a bypassed I channel and a bypassed Q channel, and the sampling of the I channel, the Q channel, the bypassed I channel and the bypassed Q channel is controlled by the multiplexer.

### Claim 23 (depends on 15)

The receiver of claim 15, further comprising selecting a gain of a second receiver chain of the receiver based on the sampling a bypass receive signal.

### Claim 24 (depends on 23)

The receiver of claim 23, further comprising the controller operative to establish a level of correlation between a receive signal of the receiver chain and a receive signal of the second receiver chain, and if the level of correlation is above a threshold, then the controller is operative to use the sampled bypass receive signal and samples of a non-bypass signal of the second receiver chain to set gains of both the receiver chain and the second receiver chain.

### Claim 25 (depends on 23)

The receiver of claim 23, wherein the controller establishing a level of correlation between a receive signal of the receiver chain and a receive signal of the second receiver chain comprises the controller operative to establish a level of out-of-band interference above a threshold for the receive signal of the receiver chain and a receive signal of the second receiver chain.