Patent ID: 8682263
Filing Date: 2014-03-25
Classification: H03F,H03H,H04B,H04W,Y02D

Abstract:
1. A system for a radio frequency (RF) transmitter, comprising: a programmable-current transmit continuous-time filter (TX-CTF) having an input configured to receive a baseband transmission signal prior to upconversion to an RF signal in the transmitter, the TX-CTF including amplifier circuitry coupled to passive circuitry to together define at least one filter parameter of the TX-CTF, the programmable-current TX-CTF further including programmable current circuitry configured to provide at least one programmable bias current to the amplifier circuitry, the programmable-current TX-CTF further including a programmable-current first CTF stage configured to receive the baseband transmission signal and including a first CTF stage amplifier circuitry and a programmable first CTF stage current circuitry configured to provide a programmable bias current to the first CTF stage amplifier circuitry in response to first digital programming data, the programmable-current TX-CTF further including a programmable-current second CTF stage configured to receive an output of the programmable-current first CTF stage and including a second CTF stage amplifier circuitry and a programmable second CTF stage current circuitry configured to provide a programmable bias current to the second CTF stage amplifier circuitry in response to second digital programming data; and control logic configured to receive one or more transmitter control signals, the control logic further configured to control the at least one programmable bias current in response to the one or more transmitter control signals, control logic further configured to produce the first and second digital programming data in response to the one or more transmitter control signals.