IP Library › Granted Patent US 10,396,735
Granted Patent B2
US 10,396,735 · App. 15/808,389 · Granted Aug 27, 2019

Amplifier system with digital switched attenuator

Inventor: Adrian John Bergsma (Ottawa, CA)
Assignee: SKYWORKS SOLUTIONS, INC.
H03G1/0088H03F3/19H03F3/21H03F3/245H03F3/45475H03G3/3042H04B10/00H04L27/0002H03F2200/411H03F2200/451H03G2201/106H04L25/085
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Quick Facts
Patent No.
US 10,396,735
App. No.
15/808,389
Granted
Aug 27, 2019
Kind
B2
Abstract

A broadband amplifier assembly is provided that includes a fixed gain amplifier coupled to an adjustable attenuator which is further coupled to a power amplifier. The adjustable attenuator includes a plurality of attenuation cells directly coupled in series between the input and the output of the adjustable attenuator.

Claims (34)

1. A broadband amplifier assembly having a signal input and a signal output, comprising:

a fixed gain amplifier having an input and an output, the input coupled to the signal input;

an adjustable attenuator having an input and an output, the input of the adjustable attenuator being coupled to the output of the fixed gain amplifier, the adjustable attenuator having a plurality of attenuation cells directly coupled in series between the input and the output of the adjustable attenuator, the adjustable attenuator having an attenuation mode of operation, a bypass mode of operation, and an isolation mode of operation; and

a power amplifier having an input and an output, the input of the power amplifier being coupled to the output of the adjustable attenuator and the output of the power amplifier being coupled to the signal output.

2. The amplifier assembly of claim 1 wherein each respective attenuation cell of the plurality of attenuation cells includes a resistive network coupled between an input of the respective attenuation cell and an output of the respective attenuation cell, the resistive network configured to provide a respective amount of attenuation in the attenuation mode of operation of the respective attenuation cell.

3. A broadband amplifier assembly having a signal input and a signal output, comprising:

a fixed gain amplifier having an input and an output, the input coupled to the signal input;

an adjustable attenuator having an input and an output, the input of the adjustable attenuator being coupled to the output of the fixed gain amplifier, the adjustable attenuator having a plurality of attenuation cells directly coupled in series between the input and the output of the adjustable attenuator, each respective attenuation cell of the plurality of attenuation cells including a resistive network coupled between an input of the respective attenuation cell and an output of the respective attenuation cell, the resistive network configured to provide a respective amount of attenuation in an attenuation mode of operation of the respective attenuation cell, each respective attenuation cell further including a shunt switch coupled between the resistive network and a reference node to selectively connect the resistive network to the reference node; and

a power amplifier having an input and an output, the input of the power amplifier being coupled to the output of the adjustable attenuator and the output of the power amplifier being coupled to the signal output.

4. The amplifier assembly of claim 3 wherein each respective attenuation cell further includes a bypass switch in parallel with the resistive network, the bypass switch configured to selectively couple the input of the respective attenuation cell to the output of the respective attenuation cell in a bypass mode of operation of the respective attenuation cell.

5. The amplifier assembly of claim 4 wherein each respective attenuation cell further includes an isolation switch coupled in series with the resistive network, the isolation switch and the resistive network being in parallel with the bypass switch, the isolation switch configured to selectively isolate the resistive network from one of the input of the respective attenuation cell or the output of the respective attenuation cell in the bypass mode of operation of the respective attenuation cell.

6. The amplifier assembly of claim 5 wherein the bypass switch and the isolation switch each include a switching element of substantially similar parasitic characteristics.

7. The amplifier assembly of claim 5 wherein the isolation switch is configured to selectively isolate the resistive network from one of the input of the respective attenuation cell or the output of the respective attenuation cell in an isolation mode of operation of the respective attenuation cell.

8. The amplifier assembly of claim 2 wherein each respective attenuation cell includes a shunt switch coupled between the resistive network and a reference node to selectively connect the resistive network to the reference node.

9. The amplifier assembly of claim 8 wherein the shunt switch includes a plurality of switching elements.

10. The amplifier assembly of claim 2 wherein each respective attenuation cell further includes a bypass switch in parallel with the resistive network, the bypass switch configured to selectively couple the input of the respective attenuation cell to the output of the respective attenuation cell in the bypass mode of operation of the respective attenuation cell.

11. A broadband amplifier assembly having a signal input and a signal output, comprising:

a fixed gain amplifier having an input and an output, the input coupled to the signal input;

an adjustable attenuator having an input and an output, the input of the adjustable attenuator being coupled to the output of the fixed gain amplifier, the adjustable attenuator having a plurality of attenuation cells directly coupled in series between the input and the output of the adjustable attenuator, the adjustable attenuator having an attenuation mode of operation, a bypass mode of operation, and an isolation mode of operation;

a variable gain amplifier having an input and an output, the input of the variable gain amplifier being coupled to the output of the adjustable attenuator and the output of the variable gain amplifier being coupled to the signal output; and

a controller configured to control an amount of attenuation provided by the adjustable attenuator in the attenuation mode of operation and an amount of gain provided by the variable gain amplifier to provide a range of overall gain combinations.

12. The amplifier assembly of claim 11 wherein each respective attenuation cell of the plurality of attenuation cells includes a resistive network coupled between an input of the respective attenuation cell and an output of the respective attenuation cell, the resistive network configured to provide a respective amount of attenuation in the attenuation mode of operation of the respective attenuation cell.

13. The amplifier assembly of claim 12 wherein each respective attenuation cell includes a shunt switch coupled between the resistive network and a reference node to selectively connect the resistive network to the reference node.

14. The amplifier assembly of claim 13 wherein each respective attenuation cell further includes a bypass switch in parallel with the resistive network, the bypass switch configured to selectively couple the input of the respective attenuation cell to the output of the respective attenuation cell in the bypass mode of operation of the respective attenuation cell.

15. The amplifier assembly of claim 14 wherein each respective attenuation cell further includes an isolation switch coupled in series with the resistive network, the isolation switch and the resistive network being in parallel with the bypass switch, the isolation switch configured to selectively isolate the resistive network from one of the input of the respective attenuation cell or the output of the respective attenuation cell in the bypass mode of operation of the respective attenuation cell.

16. The amplifier assembly of claim 15 wherein the bypass switch and the isolation switch each include a switching element of substantially similar parasitic characteristics.

17. The amplifier assembly of claim 15 wherein the isolation switch is configured to selectively isolate the resistive network from one of the input of the respective attenuation cell or the output of the respective attenuation cell in the isolation mode of operation of the respective attenuation cell.

18. A communication device, comprising:

a transceiver configured to produce a transmit signal and to receive a receive signal;

a fixed gain amplifier having an input and an output, the input coupled to the transceiver to receive the transmit signal;

an adjustable attenuator having an input and an output, the input of the adjustable attenuator being coupled to the output of the fixed gain amplifier, the adjustable attenuator having a plurality of attenuation cells directly coupled in series between the input and the output of the adjustable attenuator, the adjustable attenuator having an attenuation mode of operation, a bypass mode of operation, and an isolation mode of operation; and

a power amplifier having an input and an output, the input of the power amplifier being coupled to the output of the adjustable attenuator and the output of the power amplifier being coupled to an output terminal.

19. The communication device of claim 18 wherein the power amplifier is a variable gain amplifier.

20. The communication device of claim 18 further comprising a receive amplifier coupled to the transceiver to provide the receive signal.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 5, 2018
From: BERGSMA, ADRIAN JOHN
To: SKYWORKS SOLUTIONS, INC.
Reel/Frame 047080/0073 →
Continuity (2)
Provisional Application 62420681 · Nov 11, 2016
Related Publication 20180138874A1 · May 17, 2018
Cited By (3)
US 12,261,635 US 12,562,717 US 12,750,039