Serial bus interface for direct conversion receiver
First Claim
1. A method of controlling one or more analog circuits via a serial bus, comprising:
- receiving a control for a particular analog circuit;
forming a message corresponding to the received control;
sending the message over the serial bus;
receiving the message at the particular analog circuit; and
adjusting one or more characteristics of the particular analog circuit based on the received message.
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Accused Products
Abstract
A direct downconversion receiver architecture having a DC loop to remove DC offset from the signal components, a digital variable gain amplifier (DVGA) to provide a range of gains, an automatic gain control (AGC) loop to provide gain control for the DVGA and RF/analog circuitry, and a serial bus interface (SBI) unit to provide controls for the RF/analog circuitry via a serial bus. The DVGA may be advantageously designed and located as described herein. The operating mode of the VGA loop may be selected based on the operating mode of the DC loop, since these two loops interact with one another. The duration of time the DC loop is operated in an acquisition mode may be selected to be inversely proportional to the DC loop bandwidth in the acquisition mode. The controls for some or all of the RF/analog circuitry may be provided via the serial bus.
59 Citations
12 Claims
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1. A method of controlling one or more analog circuits via a serial bus, comprising:
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receiving a control for a particular analog circuit;
forming a message corresponding to the received control;
sending the message over the serial bus;
receiving the message at the particular analog circuit; and
adjusting one or more characteristics of the particular analog circuit based on the received message. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for controlling one or more analog circuits via a serial bus, comprising:
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means for receiving a control for a particular analog circuit;
means for forming a message corresponding to the received control;
means for sending the message over the serial bus;
means for receiving the message at the particular analog circuit; and
means for adjusting one or more characteristics of the particular analog circuit based on the received message.
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8. A receiver unit comprising:
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an RF front-end unit operative to amplify, downconvert, and digitize a received signal to provide samples;
a digital signal processor operative to process the samples to provide output data; and
a serial bus interface (SBI) unit operative to provide controls for the RF front-end unit via a serial bus. - View Dependent Claims (9, 10, 11, 12)
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Specification