Patent ID: 8260218
Filing Date: 2012-09-04
Classification: H03D,H03F,H04B

Abstract:
1. A mixer circuit comprising a mixer core for mixing an input frequency signal with a local oscillator signal, the input frequency signal comprising one or more input intermediate frequency signals: a variable current block arranged to feed the mixer core with an amplified input signal, said variable current block arranged between an input for receiving the input frequency signal and the mixer core, said variable current block comprising transistors and switches to enable provision of a variable current; and a voltage-to-current conversion block comprising transistors for performing a voltage-to-current conversion, said voltage to current conversion block receiving the one or more input intermediate frequency signals, converting a difference in a voltage of said one or more input intermediate frequency signals to a difference in current and outputting to said variable current block the corresponding difference in current, wherein the local oscillator signal comprises a modulated signal generated by a digital phase locked loop circuit and modulated by phase information.