Methods and apparatus for controlling a gain state of a wireless receiver operating in an idle mode
First Claim
1. A method for controlling a gain state of a wireless receiver, the method comprising the steps of:
- receiving, during a first wake-up period of the wireless receiver, a notification signal which indicates that the wireless receiver is to be placed in a sleep mode;
reading a gain control state value from a gain controller during the first wake-up period, and storing the gain control state value in memory;
in response to the notification signal;
causing the wireless receiver to be placed in the sleep mode;
in response to expiration of a sleep mode timer for the sleep mode;
entering into a second wake-up period;
providing a selection signal for selecting, via a multiplexer, the stored gain control state value from the memory to the wireless receiver;
running a warm-up period timer for a warm-up period of the second wake-up period; and
in response to expiration of the warm-up period timer;
switching from selecting, via the multiplexer, the stored gained control state value from the memory to the wireless receiver to selecting, via the multiplexer, a current gain control state value from the gain controller to the wireless receiver, the current gain control state value being based on a signal level of a currently-received signal in the wireless receiver.
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Accused Products
Abstract
The settling time of a wireless receiver is reduced by providing a previously utilized gain control state value to an amplifier of a receiver front end during a warm-up portion of a wake-up period of the wireless receiver which follows a sleep period. One illustrative method includes the steps of receiving a notification signal which indicates that the wireless receiver is to be placed in a sleep mode, reading a gain control state value from a gain controller based on receiving the notification signal, storing the gain control state value in memory, providing the stored gain control state value from the memory to the wireless receiver during a warm-up period of a second wake-up period following the first wake-up period, and providing a gain control state value from the gain controller to the wireless receiver based on a signal level of a currently received signal of the wireless receiver after the warm-up period.
13 Citations
20 Claims
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1. A method for controlling a gain state of a wireless receiver, the method comprising the steps of:
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receiving, during a first wake-up period of the wireless receiver, a notification signal which indicates that the wireless receiver is to be placed in a sleep mode; reading a gain control state value from a gain controller during the first wake-up period, and storing the gain control state value in memory; in response to the notification signal;
causing the wireless receiver to be placed in the sleep mode;in response to expiration of a sleep mode timer for the sleep mode; entering into a second wake-up period; providing a selection signal for selecting, via a multiplexer, the stored gain control state value from the memory to the wireless receiver; running a warm-up period timer for a warm-up period of the second wake-up period; and in response to expiration of the warm-up period timer;
switching from selecting, via the multiplexer, the stored gained control state value from the memory to the wireless receiver to selecting, via the multiplexer, a current gain control state value from the gain controller to the wireless receiver, the current gain control state value being based on a signal level of a currently-received signal in the wireless receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A mobile station, comprising:
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a receiver configured to receive radio frequency (RF) signals through an antenna; an amplifier of the receiver which is configured to amplify the RF signals; a level detector configured to detect a signal level of the RF signals; a gain controller configured to provide a gain control state value at an output in response to the signal level; a multiplexer having an output coupled to a gain control input to the amplifier; a processor configured to; read a gain control state value from the gain controller during a first wake-up period of the receiver; store the gain control state value in memory; in response to receiving a notification signal which indicates that the receiver is to be placed in a sleep mode;
cause the receiver to be placed in the sleep mode;in response to expiration of a sleep mode timer for the sleep mode; cause a second wake-up period to be entered; provide a selection signal for selecting, via the multiplexer, the stored gain control state value from the memory to the amplifier for a warm-up period of the second wake-up period; run a warm-up period timer for the warm-up period; and in response to expiration of the warm-up period timer;
switch from selecting, via the multiplexer, the stored gained control state value from the memory to the amplifier to selecting, via the multiplexer, a current gain control state value from the gain controller to the amplifier, the current gain control state value being based on a signal level of a currently-received signal in the receiver. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A circuit for a wireless receiver, comprising:
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an amplifier configured to amplify radio frequency (RF) signals in the wireless receiver; a level detector configured to detect a signal level of the RF signals; a gain controller configured to provide a gain control state value in response to the signal level; a multiplexer having an output for providing a gain control input to the amplifier; and a processor configured to; read a gain control state value from the gain controller during a first wake-up period of the wireless receiver; store the gain control state value in memory; in response to receiving a notification signal which indicates that the receiver is to be placed in a sleep mode;
cause the wireless receiver to be placed in the sleep mode;in response to expiration of a sleep mode timer for the sleep mode; cause the wireless receiver to enter into a second wake-up period; provide a selection signal for selecting, via the multiplexer, the stored gain control state value from the memory to the amplifier for a warm-up period of the second wake-up period; run a warm-up period timer for the warm-up period of the second wake-up period; and in response to expiration of the warm-up period timer;
switch from selecting, via the multiplexer, the stored gained control state value from the memory to the amplifier to selecting, via the multiplexer, a current gain control state value from the gain controller to the amplifier, the current gain control state value being based on a signal level of a currently received signal in the wireless receiver. - View Dependent Claims (19)
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20. A circuit for a wireless receiver, comprising:
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a front end stage having a low noise amplifier (LNA) which is configured to amplify radio frequency (RF) signals received via the front end stage; a down converter having an input which is coupled to an output of the front end stage, the down converter including a mixer; an intermediate frequency (IF) or bandband stage having an input coupled to an output of the down converter; a level detector having an input coupled to an output of the IF or baseband stage, the level detector being configured to detect a signal level of the processed RF signals; a gain controller which is configured to provide a gain control state value in response to the signal level; a multiplexer having an output coupled to a gain control input to the LNA; and a processor which is configured to read a gain control state value from the gain controller during a first wake-up period of the wireless receiver;
store the gain control state value in memory;
provide a selection signal for selecting, via the multiplexer, the stored gain control state value from the memory to the LNA during a warm-up period of a second wake-up period following the first wake-up period; and
select, via the multiplexer, after the warm-up period of the second wake-up period, a current gain control state value from the gain controller to the LNA, the current gain control state value being based on a signal level of a currently received signal in the wireless receiver.
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Specification