US 6,982,584 B2
Phase quadrature and slaved working frequency signal generator
Thierry Melly, Lausanne (Switzerland)
Assigned to CSEM Centre Suisse d'Electronique et de Microtechnique S.A. Recherche et Developpement, Neuchatel (Switzerland)
Filed on Jan. 20, 2004, as Appl. No. 10/759,530.
Claims priority of application No. 03075206 (EP), filed on Jan. 21, 2003.
Prior Publication US 2004/0196084 A1, Oct. 07, 2004
Int. Cl. H03H 11/16 (2006.01)
U.S. Cl. 327—254 8 Claims
OG exemplary drawing
 
1. In a phase quadrature signal generator including a phase shifter receiving at an input terminal an input signal supplied to phase shifting means formed of passive elements, arranged for delivering at first and second output terminals, first and second in phase quadrature signals, wherein it further includes, between the phase shifting means and the output terminals, transconductor means having a transconductance proportional to the passive elements, arranged so as to obtain a transfer function between said first and second in phase quadrature signals independent of said passive elements,
wherein said phase shifting means include:
a first phase shifter circuit including a first resistor connected between the input terminal and a first output of the phase shifting means and a first capacitor connected between the first output of the phase shifting means and a reference potential,
a second phase shifter circuit including a second capacitor, matched to said first capacitor, connected between the input terminal and a second output of the phase shifting means and a second resistor, matched to said first resistor, connected between the second output of the phase shifting means and said reference potential
and wherein said transconductor means include
a first transconductor circuit having a first determined transconductance proportional to a capacitance matched to the capacitance of said first and second capacitors, and
a second transconductor circuit having a second determined transconductance proportional to a conductance matched with said first and second resistors.