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US 7,610,029 B2Granted
Method for active Gm-C filter gain control
AssigneeBroadcom Corporation
InventorQiang Li
Life of this patent
Estimating the term…
Abstract
An integrated circuit chip include a transmitter configured for transmitting an electromagnetic signal, a receiver configured for receiving an electromagnetic signal, and an amplifier operatively coupled to the receiver. The amplifier includes a plurality of variable-gain Gm-C filter stages connected in series and configured for selectively amplifying frequency components within a frequency bandwidth of the received electromagnetic signal.
Claims26
An integrated circuit chip comprising:
- a transmitter configured for transmitting an electromagnetic signal;
- a receiver configured for receiving an electromagnetic signal;
- an amplifier operatively coupled to the receiver, wherein the amplifier comprises a plurality of variable-gain Gm-C filter stages connected in series and configured for selectively amplifying frequency components within a frequency bandwidth of the received electromagnetic signal;
- wherein an input stage of at least one of the variable gain Gm-C filter stages comprises a first transconductor and a second transconductor, both of the transconductors having their inputs and outputs connected in parallel;
- wherein a gain of the first transconductor is more than about 8 dB greater than a gain of the second transconductor.
2 more elements
A method of processing a signal in a wireless receiver integrated circuit chip, the method comprising:
- receiving an electromagnetic signal;
- amplifying the received signal in a plurality of variable-gain Gm-C filter stages connected in series and configured for selectively amplifying frequency components of the received electromagnetic signal,
- wherein an input stage of at least one variable gain Gm-C filter stage comprises a first transconductor and a second transconductor, both of the transconductors having their inputs and outputs connected in parallel and wherein a gain of the first transconductor is greater than a gain of the second transconductor.
An integrated circuit chip comprising:
- a transmitter configured for transmitting an electromagnetic signal;
- a receiver configured for receiving an electromagnetic signal;
- an amplifier operatively coupled to the receiver, wherein the amplifier comprises a plurality of variable-gain Gm-C filter stages connected in series and configured for selectively amplifying frequency components within a frequency bandwidth of the received electromagnetic signal, wherein an input stage of at least one variable gain Gm-C filter stage comprises a first transconductor and a second transconductor, both of the transconductors having their inputs and outputs connected in parallel;
- and
- a variable resistor operably connected between an output of the second transconductor and ground,
- wherein the gain of the second transconductor is adapted to be varied continuously, and
- wherein the first transconductor is adapted to be operatively coupled to, and operatively decoupled from, the at least one variable gain Gm-C filter stage, and
- wherein the resistance of the variable resistor is variable, such that the frequency bandwidth when the first transconductor is coupled to the at least one variable gain Gm-C filter state is approximately equal to the frequency bandwidth when the first transconductor is decoupled from the at least one variable gain Gm-C filter state.
5 more elements
An integrated circuit chip comprising:
- a transmitter configured for transmitting an electromagnetic signal;
- a receiver configured for receiving an electromagnetic signal;
- and
- an amplifier operatively coupled to the receiver, wherein the amplifier comprises a plurality of variable-gain Gm-C filter stages connected in series and configured for selectively amplifying frequency components within a frequency bandwidth of the received electromagnetic signal, wherein an input stage of at least one variable gain Gm-C filter stage comprises a first transconductor and a second transconductor, both of the transconductors having their inputs and outputs connected in parallel, and third transconductor having an input operatively connected to inputs of the first transconductor and to the second transconductor and having an output that is operatively unconnected from the outputs of the first and second transconductors.
1 more element
Dependencies are inferred from the claim text.