Device for the lock - in - amplification of an input signal and a method for generating a reference signal for a lock - in - amplifier

摘要

Device for the lock - in - amplification of an input signal (s_I), the one or more lock - in - amplifier (304, 307, 308; 422, 423, 424; 504, 507, 515, 516) with a first input terminal (in) for the input signal (s_I), the lock - in - that is to be amplified, and a second input terminal (ref) for a reference signal, characterised in that at least one phase locked loop circuit (312; 508, 514) is provided, wherein the phase locked loop circuit (312; 508, 514) one of the one or more lock - in - amplifiers (304; 422, 504; 515), an oscillator (306; 506, 511) and a feedback path (303; 421; 503, 517) from the oscillator (306; 506, 511) to the second input terminal (ref) of the one lock - in - amplifier (304; 422, 504; 515), wherein an inlet port of the at least one phase locked loop circuit (312; 508, 514) with the first input terminal (in) of the one or more lock - in - amplifier (304, 307, 308; 422, 423, 424; 504, 507, 515, 516) is connected and one output terminal of the oscillator (306; 506, 511) with the second input terminal (ref) of the one or..