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 operating in an idle mode, 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;
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;
running a sleep mode timer for the sleep mode;
in response to expiration of the sleep mode timer;
causing the wireless receiver to be exited from the sleep mode for entering into a second wake-up period;
providing 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;
in response to expiration of the warm-up period timer;
switching from use of the stored gained control state value by the wireless receiver to a gain control state value from the gain controller which is 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 a low noise amplifier (LNA) 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.
34 Citations
25 Claims
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1. A method for controlling a gain state of a wireless receiver operating in an idle mode, 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; 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; running a sleep mode timer for the sleep mode; in response to expiration of the sleep mode timer; causing the wireless receiver to be exited from the sleep mode for entering into a second wake-up period; providing 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; in response to expiration of the warm-up period timer;
switching from use of the stored gained control state value by the wireless receiver to a gain control state value from the gain controller which is 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, 10, 11)
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12. A mobile station, comprising:
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a receiver adapted to receive radio frequency (RF) signals through an antenna; an amplifier of the receiver which is adapted to amplify the RF signals; a level detector adapted to detect a signal level of the RF signals; a gain controller adapted to provide a gain control state value in response to the signal level; and a processor adapted 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; run a sleep mode timer for the sleep mode; in response to expiration of the sleep mode timer; cause the receiver to be exited from the sleep mode for entering into a second wake-up period; provide a selection signal for selecting 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 use of the stored gained control state value by the amplifier to a gain control state value from the gain controller which is based on a signal level of a currently received signal in the receiver. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A circuit for a wireless receiver, comprising:
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a low noise amplifier (LNA) adapted to amplify radio frequency (RF) signals in the wireless receiver; a level detector adapted to detect a signal level of the RF signals; a gain controller adapted to provide a gain control state value in response to the signal level; and a processor adapted 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; run a sleep mode timer for the sleep mode; in response to expiration of the sleep mode timer; cause the wireless receiver to be exited from the sleep mode for entering into a second wake-up period; provide a selection signal for selecting the stored gain control state value from the memory to the LNA 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;
cause a switch from use of the stored gained control state value by the LNA to a gain control state value from the gain controller which is based on a signal level of a currently received signal in the wireless receiver.
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Specification