Power control on a packet-by-packet basis in a CMOS transceiver
A transceiver includes a power control circuit in the transmitter that operates on a packet-by-packet basis. The transceiver can, for each packet, set a variable gain amplifier to a first gain and use predetermined gain increments to thereafter increase gain until a gain hold event. The gain hold event can be an expiration of a time duration allocated for changing gain or a desired power being reached, whichever event occurs first. The gain can be adjusted by a predetermined amount based on an operating condition.
1. A method of transmitting packets, the method comprising:
determining whether an output power of a power amplifier reaches a desired power when transmitting a packet;
increasing a gain of a variable gain amplifier (VGA) by a predetermined increment when the output power does not reach the desired power;
repeating determining and increasing the gain until a gain hold event, the gain hold event being first of a time duration allocated for changing gain expiring and the desired power being reached,
wherein the VGA uses a gain associated with the gain hold event to transmit a remainder of the packet.
2. The method of transmitting packets of claim 1 , wherein for each subsequent packet being transmitted, further including:
setting the VGA to the gain associated with the gain hold event of a last transmitted packet; and
repeating determining and increasing the gain until another gain hold event.
3. The method of transmitting packets of claim 1 , wherein for each subsequent packet being transmitted, further including:
setting the VGA to the gain associated with the gain hold event of a last transmitted packet minus a predetermined gain; and
repeating determining and increasing the gain until another gain hold event.
4. The method of transmitting packets of claim 3 , wherein the predetermined gain is user-configurable.
5. The method of transmitting packets of claim 3 , wherein the predetermined gain varies based on an operating condition.
6. The method of transmitting packets of claim 1 , wherein for each subsequent packet being transmitted, further including:
setting the VGA to the gain associated with the gain hold event of a last transmitted packet minus a predetermined number of increments; and
repeating determining and increasing the gain until another gain hold event.
7. The method of transmitting packets of claim 1 , further including:
setting the VGA to an initial gain value.
8. A method of transmitting packets, the method comprising:
for an initial packet, setting a variable gain amplifier (VGA) to an initial gain and using predetermined gain increments to thereafter increase gain until a gain hold event; and
for subsequent packets, setting the VGA to a gain associated with the gain hold event of a last transmitted packet and using the predetermined gain increments to thereafter increase gain until the gain hold event,
wherein the gain hold event is one of a time duration allocated for changing gain expiring and a desired power being reached, whichever occurs first.
9. The method of transmitting packets of claim 8 , wherein for subsequent packets, further including:
setting the VGA to the gain associated with the gain hold event of a last transmitted packet minus a predetermined gain based on an operating condition.
10. The method of transmitting packets of claim 8 , wherein for subsequent packets, further including:
setting the VGA to the gain associated with the gain hold event of a last transmitted packet minus a predetermined number of increments based on an operating condition.
11. A method of transmitting packets, the method comprising:
for each packet, setting a variable gain amplifier (VGA) to a first gain and using predetermined gain increments to thereafter increase gain until a gain hold event,
wherein the gain hold event is one of a time duration allocated for changing gain expiring and a desired power being reached, whichever occurs first.
12. The method of transmitting packets of claim 11 , wherein the first gain is an initial gain.
13. The method of transmitting packets of claim 11 , wherein the first gain is a gain associated with the gain hold event of a last transmitted packet.
14. The method of transmitting packets of claim 11 , further including:
setting the VGA to the gain associated with the gain hold event of a last transmitted packet minus a predetermined gain based on an operating condition.
15. The method of transmitting packets of claim 11 , further including:
setting the VGA to the gain associated with the gain hold event of a last transmitted packet minus a predetermined number of increments based on an operating condition.
16. A method of transmitting packets, the method comprising:
on a packet-by-packet basis, setting a variable gain amplifier (VGA) to a first gain and using predetermined gain increments to thereafter increase gain until a gain hold event,
wherein the gain hold event is one of a time duration allocated for changing gain expiring and a desired power being reached.
17. The method of transmitting packets of claim 16 , further including:
setting the VGA to the gain associated with the gain hold event of a last transmitted packet minus a predetermined gain based on an operating condition.
18. The method of transmitting packets of claim 16 , further including:
setting the VGA to the gain associated with the gain hold event of a last transmitted packet minus a predetermined number of increments based on an operating condition.