hi, I am working on S6700 multiprotocol transceiver IC . I have to design transmitter and receiver blocks. transmitter side: ASK modulator and antenna driver. receiver side: demodulator,mixer,level shifter,low pass filter,high pass filter,schmitt trigger. I dont have any specifications related to this particular IC. If u can suggest any circuit diagram with design details for mixer than send me immediately its urgent. operating frequency is 13.56MHZ regards, jyoti