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US 7,023,245 B2Granted
Versatile charge sampling circuits
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorJiren Yuan
Life of this patent
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Abstract
A charge sampling circuit, has a control signal generator for controlling an analog input signal to the charge sampling circuit to be integrated by an integrator during a sampling phase responsive to a sampling signal from the control signal generator. The current of the analog input signal is integrated to an integrated charge for producing a proportional voltage or current sample at a signal output at the end of the sampling phase.
Claims2
A two-step band-pass charge sampling circuit comprising a first and second band-pass charge sampling circuit comprising:
- a first signal input and a second signal input for receiving a first and second end of a differential analog signal, respectively, in said first band-pass charge sampling circuit for producing signal samples at the signal output or output pair of said first band-pass charge sampling circuit with a first sample rate;
- a chopping circuit for chopping the signal from the first band-pass charge sampling circuit symmetrically in time at its signal output or output pair with the frequency of a clock signal equal to said first sample rate;
- a differential-out amplifier for amplifying the signal from the chopping circuit differentially at its signal output pair;
- wherein the first signal input and the second signal input of said second band-pass charge sampling circuit are connected to the signal output pair of said amplifier for producing signal samples at the signal output or output pair with a second sample rate.
1 more element
Dependencies are inferred from the claim text.