Patent ID: 7667505

Claim:
An apparatus comprising: a voltage rail; a first Muller C-element having: a first set of differential input transistor pairs, wherein at least one of the differential input transistors from the first set of differential input transistor pairs receives an in-phase component of an input signal, and wherein at least one of the differential input transistors from the first set of differential input transistor pairs receives a quadrature component of the input signal; a first impedance element that is coupled between the voltage rail and at least one transistor from each differential input transistor pair from the first set of differential input transistor pairs; a second impedance element that is coupled between the voltage rail and at least one transistor from each differential input transistor pair from the first set of differential input transistor pairs; and a first pair of cross-coupled transistors, wherein each transistor from the first pair of cross-coupled transistors is coupled to at least one of the first and second impedance elements; and a second Muller C-element having: a second set of differential input transistor pairs, wherein at least one of the differential input transistors from the second set of differential input transistor pairs receives the in-phase component of the input signal, and wherein at least one of the differential input transistors from the second set of differential input transistor pairs receives the quadrature component of the input signal, and wherein each differential input transistor pair from the first set of differential input transistor pairs is coupled to at least one of the differential input transistor pairs from the second set of differential input transistor pairs, and wherein each differential input transistor pair from the second set of differential input transistor pairs is coupled to at least one of the differential input transistor pairs from the first set of differential input transistor pairs; a third impedance element that is coupled between the voltage rail and at least one transistor from each differential input transistor pair from the second set of differential input transistor pairs; a fourth impedance element that is coupled between the voltage rail and at least one transistor from each differential input transistor pair from the second set of differential input transistor pairs; and a second pair of cross-coupled transistors, wherein each transistor from the second pair of cross-coupled transistors is coupled to at least one of the third and fourth impedance elements.