Analog tracking circuit to improve dynamic and static image rejection of a frequency converter

A frequency converter arrangement for converting a first signal centered at a first frequency to a second signal centered at a second frequency different from the first frequency, the frequency converter arrangement comprising:

• local oscillator (LO) circuitry comprising:
• duty cycle correction circuitry to adjust a duty cycle of a pair of input clock signals to provide a pair of output clock signals, wherein the duty cycle correction circuitry comprises:
• (1) coarse tuning circuitry configured to correct the duty cycle of the pair of input clock signals, the coarse tuning circuitry responsive to a digital calibration code;
• and
• (2) an analog feedback circuit comprising an analog input coupled to receive an analog signal generated from the pair of output clock signals and an analog output comprising a pair of differential clock paths provided to the coarse tuning circuitry, the analog feedback circuit comprising a current steering element coupled to the pair of differential clock paths, the current steering element configured to steer, responsive to an analog feedback signal, at least one of a first current to one clock path of the pair of differential clock paths or a second current to another clock path of the pair of differential clock paths;
• and
• quadrature divider circuitry coupled to an output of the duty cycle correction circuitry, wherein the quadrature divider circuitry generates an in-phase LO signal and a quadrature-phase LO signal from the pair of output clock signals at outputs of the duty cycle correction circuitry;
• and
• in-phase, quadrature-phase (IQ) mixer circuitry coupled to the LO circuitry.