Abstract: An apparatus, and method therefor, relate generally to broadband IQ generation. In this apparatus, related generally to broadband in-phase and quadrature phase (“IQ”) generation, a divider circuit and a polyphase filter circuit are configured for receiving an oscillator output. The polyphase filter circuit is configured for polyphase filtering the oscillator output into a first quadrature output. The divider circuit is configured for dividing the oscillator output into a second quadrature output. A multiplexer circuit is coupled to the divider circuit and the polyphase filter circuit and configured for selecting either the first quadrature output or the second quadrature output as an IQ output based on a bandwidth of the oscillator output.

Abstract: A charge pump includes a reference charge pump with an input interface to accept a phase detector signal and a duty-cycle feedback signal, and an output to supply a control voltage. A replica charge pump accepts the phase detector signal supplies the duty-cycle feedback signal. If the reference charge pump source current (Ip) becomes mismatched with the sinking current (In), non-equal Tn and Tp time periods may result. The phase detector accepts reference and data signals having a steady state offset error and supplies a non-50% duty cycle square wave phase detector signal. The replica charge pump supplies a duty-cycle feedback signal to the reference charge pump responsive to the non-50% duty cycle phase detector signal and the reference charge pump equalizes the source and sink currents. When the phase detector measures reference and data signals fully orthogonal in phase, it supplies s 50% duty cycle signal.

Abstract: Methods and systems for robust single sideband LO generation are disclosed. Aspects of one method may include generating LO output signals where a VCO may generate a signal that may be used to generate a first pair of signals and a second pair of signals. The first pair of signals, with a frequency of 1.8 GHz, may be 90° out of phase With each other, and the second pair of signals, with a frequency of 800 MHz, may be 90° out of phase with each other. The second pair of signals may be linearly amplified and low-pass filtered. The filtered signals may be mixed with the first pair of signals to generate the LO output signals. A corner frequency for the low-pass filter may be substantially 1.5 times the frequency of a fundamental frequency for the signal to be filtered. Various embodiments of the invention may generate differential output signals, including the LO output signals.