Sampling phase detector
AssigneeRobert Bosch GmbH
InventorHerbert Brauns
Life of this patent
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Abstract
The sampling phase detector whose output signal (fd) has a very broad-band and a very even frequency response characteristic includes a step-recovery-diode (SRD) to which a series circuit including at least two diodes (D1,D2) is connected in parallel by means of coupling capacitors (Ck1,Ck2). An input signal is fed to the diodes (D1,D2) by means of an R/C-network (R1,R2,C3,C4) and an output signal (fd) is taken off, which corresponds to the phase shift between an input signal (fo) and a reference signal (fr). The reference signal (fr) is fed to the step-recovery-diode (SRD) via a balancing transformer (Tr). Decoupling resistors (Rs1,Rs2) are included in the connecting lines from the balancing transformer (Tr) to the step-recovery-diode (SRD), which damp interfering resonances or reflections of the balancing transformer.
Claims5
A sampling phase detector comprising
- a step-recovery-diode (SRD),
- a series circuit connected in parallel to said step-recovery-diode (SRD) by means of coupling capacitors (Ck1,Ck2), said series circuit including at least two diodes (D1,D2) electrically connected in series with each other;
- a balancing transformer for supplying a reference signal (fr) to said step-recovery-diode (SRD), said balancing transformer (Tr) being connected electrically to said step-recovery-diode (SRD) via respective connecting lines;
- a decoupling network for supplying an input signal to said at least two diodes (D1,D2) so that an output signal characteristic of a phase shift between the input signal and the reference signal is read from the at least two diodes;
- and
- decoupling resistors (Rs1,Rs2) connected in said connecting lines between the step-recovery-diode (SRD) and the balancing transformer;
- wherein resistances of the decoupling resistors (Rs1,Rs2) are selected so that said decoupling resistors (Rs1,Rs2) damp interfering resonances or reflections between the balancing transformer (Tr) and the step-recovery-diode (SRD).
Dependencies are inferred from the claim text.