Programmable transmit continuous-time filter
AssigneeSkyworks Solutions, Inc.
InventorsSandeep Louis D'Souza, Bipul Agarwal
Life of this patent
Estimating the term…
Abstract
A programmable-current transmit continuous-time filter (TX-CTF) system can be included in a radio frequency (RF) transmitter. The input of the TX-CTF can receive a baseband transmission signal, and the output of the TX-CTF can be provided to an upconversion mixer for conversion to RF for transmission. The TX-CTF includes amplifier circuitry and passive circuitry that together define the filter parameters. The TX-CTF further includes programmable current circuitry that provides a programmable bias current to the amplifier circuitry. The TX-CTF system also includes control logic that receives one or more transmitter control signals and, in response, generates signals that control the bias current provided to the TX-CTF.
Claims21
(canceled)
A radio frequency (RF) transmitter comprising:
- a programmable-current transmit continuous-time filter (TX-CTF) including a programmable-current first CTF stage having an input configured to receive a baseband transmission signal, first CTF stage amplifier circuitry, and programmable first CTF stage current circuitry configured to provide a first stage bias current generated in response to first digital programming data to the first CTF stage amplifier circuitry, the programmable-current TX-CTF further including a programmable-current second CTF stage having an input configured to receive an output of the programmable-current first CTF stage, second CTF stage amplifier circuitry, and programmable second CTF stage current circuitry configured to provide a second stage bias current generated in response to second digital programming data to the second CTF stage amplifier circuitry;
- and
- control logic configured, in response to the one or more transmitter control signals, to produce the first and second digital programming data.
A method of operating a radio frequency (RF) transmitter, comprising:
- providing a baseband transmission signal to an input of a programmable-current transmit continuous-time filter (TX-CTF);
- producing first digital programming data and second digital programming data in response to the one or more transmitter control signals;
- in response to the first digital programming data, using programmable first CTF stage current circuitry of a programmable-current first CTF stage of the programmable-current TX-CTF to generate a first programmable bias current;
- providing the first programmable bias current to first CTF stage amplifier circuitry of the programmable-current first CTF stage;
- in response to the second digital programming data, using programmable second CTF stage current circuitry of a programmable-current second CTF stage of the programmable-current TX-CTF to generate a second programmable bias current;
- and
- providing the second programmable bias current to second CTF stage amplifier circuitry of the programmable-current second CTF stage.
A method for operating a radio frequency (RF) transmitter, comprising:
- providing a baseband transmission signal to an input of a programmable-current transmit continuous-time filter (TX-CTF), the programmable-current TX-CTF further including a programmable-current first CTF stage having an input receiving the baseband transmission signal and a programmable-current second CTF stage having an input receiving an output of the programmable-current first CTF stage;
- providing a high bias current to amplifier circuitry of the programmable-current first CTF stage in response to a transmitter power signal indicating a high transmit power;
- providing a low bias current to the amplifier circuitry of the programmable-current first CTF stage in response to the transmitter power signal indicating a low transmit power;
- and
- providing an output of the programmable-current TX-CTF to an upconverter in the transmitter.
A radio frequency (RF) transmitter, comprising:
- a programmable-current transmit continuous-time filter (TX-CTF) including an input configured to receive a baseband transmission signal, a programmable-current first CTF stage having an input configured to receive the baseband transmission signal, and a programmable-current second CTF stage having an input configured to receive an output of the programmable-current first CTF stage;
- control logic configured to provide a high bias current to amplifier circuitry of the programmable-current first CTF stage in response to a transmitter power signal indicating a high transmit power and to provide a low bias current to the amplifier circuitry of the programmable-current first CTF stage in response to the transmitter power signal indicating a low transmit power;
- and
- an upconverter configured to receive an output of the programmable-current TX-CTF.
Dependencies are inferred from the claim text.