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US 7,088,985 B2Granted
Low-noise filter for a wireless receiver
AssigneeSkyworks Solutions, Inc.
InventorAly M. Ismail
Life of this patent
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Abstract
A low-noise filter for a wireless receiver is disclosed. The low-noise filter comprises an amplifier and a filter comprising a frequency dependent negative resistance implemented using a general impedance converter to realize a bi-quad filter. The low-noise filter is implemented such that noise generated by the filter when an in-band signal is processed is prevented from appearing at the output of the amplifier stage.
Claims19
A method for filtering a receive signal in a wireless receiver, comprising:
- providing a received signal to an amplifier;
- and
- filtering the received signal using a circuit comprising a single frequency dependent negative resistance configured to realize a bi-quad filter electrically isolated from an input of the amplifier such that noise contributed by the circuit is blocked from an output of the amplifier at a first frequency, wherein filtering at the first frequency is performed via a single voltage-to-current conversion and a single current-to-voltage conversion.
A low-noise filter for a wireless receiver, comprising:
- an amplifier;
- and
- a circuit comprising a single frequency dependent negative resistance implemented using a general impedance convener to realize a bi-quad filter electrically isolated from the amplifier input, the circuit configured such that noise generated by the circuit is prevented from appearing on a received signal at a first frequency, wherein the amplifier and the frequency dependent negative resistance perform a voltage-to-current conversion and a current-to-voltage conversion, respectively at a first frequency.
A portable transceiver, comprising:
- a modulator configured to receive and modulate a data signal;
- an upconverter configured to receive the modulated data signal and provide a radio frequency (RF) signal;
- a transmitter configured to transmit the RF signal;
- and
- a direct conversion receiver including an amplifier and a filter, the filter comprising a single frequency dependent negative resistance implemented using a general impedance converter to realize a bi-quad filter electrically isolated from the amplifier input and configured such that noise generated by the filter is prevented from appearing on a received signal at a first frequency, wherein the amplifier and the frequency dependent negative resistance perform a single voltage-to-current conversion and a single current-to-voltage conversion.
2 more elements
A portable transceiver, comprising:
- means for modulating a data signal;
- means for upconverting the modulated data signal and provide a radio frequency (RF) signal;
- means for transmitting the RF signal;
- means for converting a received signal to a baseband signal;
- and
- means for filtering the baseband signal so that noise generated by the filter means is prevented from appearing on the received signal at a first frequency, the means for filtering comprising a single frequency dependent negative resistance configured to realize a bi-quad filter electrically isolated from an input of the amplifier, wherein the means for filtering performs a single voltage-to-current conversion and a single current-to-voltage conversion.
3 more elements
Dependencies are inferred from the claim text.