Patent ID: 8498602

Claim:
Architecture of direct sampling mixer with discrete-time filtering (DSMF) for open wireless architecture (OWA) radio frequency (RF) front-end, said architecture comprising: a) LO (local oscillator) switch unit switching amplified balanced RF current from transconductance stage by LO signal, and integrating into sampling capacitors C H and C R , which forms charge sampling, b) Sampling and Rotating unit distributing integrated charge between said sampling capacitors C H and C R wherein C R is a rotating capacitor and C H is a history capacitor at a frequency of f LO /N (frequency of LO clock/N samples) switched by clocks SA 1,2 , SB 1,2 including clocks SA 1 , SA 2 , SB 1 , SB 2 which forms first IIR (infinite impulse response) filter, c) Output buffering unit reading combination charge stored in said C R including group of parallel rotating capacitors C R1 , C R2 and group of parallel rotating capacitors C R3 , C R4 out into output buffer capacitor C B at an even lower frequency f LO /(2N) switched by clock SAZ for said C R1 , C R2 and clock SA for said C R3 , C R4 , wherein N is the ratio of f LO /f CLK (frequency of local oscillator/frequency of clock), which forms second IIR (infinite impulse response) filter, and d) Discharge and DC (direct current) reset unit providing proper IF (intermediate frequency) voltage output from said DSMF to following IF systems including analog to digital converter.