Multiband or multimode receiver with shared bias circuit
First Claim
1. A multiband receiver with a shared bias circuit comprising:
- an antenna configured to receive and convert a wireless signal to a received signal;
one or more antenna switches configured to route the received signal to only one of one or more filters, wherein the one or more antenna switches are responsive to an antenna switch control signal;
one or more filters configured to process the received signal to create a filtered received signal wherein the one or more filters are configures such that only one of the one or more filters receives and processes a received signal at a time;
two or more amplifiers, biased with an amplifier bias signal from a shared bias circuit, the two or more amplifiers configured to selectively amplify the filtered received signal to create an amplified signal;
a shared bias circuit comprising;
a bias circuit configured to generate an amplifier bias signal;
a bias switch network configured to selectively provide the amplifier bias signal to only one of the two or more amplifiers, wherein the bias switch network is responsive to a bias switch control signal.
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Accused Products
Abstract
A multi-band communication device with a front end antenna switch module and shared bias circuit is disclosed. Control inputs determine signal routing and amplifier biasing in response to the communication device'"'"'s mode or band of operation. A received signal is routed to an active path, which corresponds to the band of the received signal. A received signal is selectively switched to one or more switch outputs, which connect to one or more filters matched to the band of the received signal. After filtering, the signal is directly provided to an active amplifier. An amplifier is activated by a bias signal received from a shared bias circuit. The shared bias circuit generates a bias signal which is selectively switched to an amplifier associated with an active path.
65 Citations
21 Claims
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1. A multiband receiver with a shared bias circuit comprising:
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an antenna configured to receive and convert a wireless signal to a received signal; one or more antenna switches configured to route the received signal to only one of one or more filters, wherein the one or more antenna switches are responsive to an antenna switch control signal; one or more filters configured to process the received signal to create a filtered received signal wherein the one or more filters are configures such that only one of the one or more filters receives and processes a received signal at a time; two or more amplifiers, biased with an amplifier bias signal from a shared bias circuit, the two or more amplifiers configured to selectively amplify the filtered received signal to create an amplified signal; a shared bias circuit comprising; a bias circuit configured to generate an amplifier bias signal; a bias switch network configured to selectively provide the amplifier bias signal to only one of the two or more amplifiers, wherein the bias switch network is responsive to a bias switch control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A shared bias system and signal path for use in a receiver comprising:
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two or more filters, wherein each filter is configured for a frequency band and only one filter receives and filters a signal at a time; two or more amplifiers, wherein of the two or more amplifiers only one amplifier receives a signal from a filter and amplifies a signal at a time; a shared bias circuit configured to generate a bias signal for the two or more amplifiers; one or more bias switches configured to selectively connect the bias signal to an amplifier selected from the two or more amplifiers, wherein the one or more switches are controlled by one or more control signals; a controller configured to generate the one or more control signals responsive to the frequency band of a received signal or a band indicator signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for receiving and amplifying an incoming signal in a receiver comprising:
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determining a mode of operation, wherein in response to determining the mode of operation only one active path, selected from two or more received signals paths within the receiver, is active; receiving a received signal; selectively routing the received signal to only one active path; filtering the received signal with only one active path filter to create a filtered signal; generating a bias signal; controlling one or more switches to selectively connect the bias signal to only an active path amplifier amplifying the filtered signal with an active path amplifier. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification