| 摘要 |
A system for current efficient dynamic power range control in a transmitter lineup (10) can include a switched mixer (18) coupled to a switched step attenuator (20) and a switched power driver (22) coupled to the switched step attenuator. Linearity and efficiency can be substantially maintained for more than 70dB of dynamic power range for the system. The dynamic power range control can all occur within the radio frequency range and current can be dynamically switched along with the output power. The transmitter can allow for over 30dB of continuous power control and over 45dB of discrete power control. The switched power driver can further include continuous power control via a stacked current steer (202) and stepped power control via a current switched IQ summer amplifier (204, 206, 208, 209, 214, 216, 218, 219) where the steered current switched IQ summer amplifier can provide over 60dB power control range.
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