Digital noise coupling circuit and continuous time modulator including the same
AssigneesSamsung Electronics Co., Ltd., Korea Advanced Institute of Science and Technology
InventorsSeong Joong Kim, Seung Tak Ryu, Kent Edrian Lozada
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Abstract
A digital noise coupling circuit includes: an analog-to-digital converter (ADC) configured to convert a quantization error, generated in a process of converting a first analog signal into a first digital signal, into a first digital error signal; a delay cell comprising delay elements configured to delay a transmission of the first digital error signal based on a clock signal; and a digital-to-analog (DA) conversion circuit configured to perform, in an analog domain, noise shaping on the first digital error signal that is delayed and transmitted from the delay cell.
Claims21
A digital noise coupling circuit comprising:
- an analog-to-digital converter (ADC) configured to convert a quantization error, generated in a process of converting a first analog signal into a first digital signal, into a first digital error signal;
- a delay cell comprising delay elements configured to delay a transmission of the first digital error signal based on a clock signal;
- and
- a digital-to-analog (DA) conversion circuit configured to convert a result of performing, in an analog domain, noise shaping on the first digital error signal that is delayed and transmitted from the delay cell into a second analog signal, and convert the first digital error signal that is delayed into a first analog error signal.
A continuous time modulator comprising:
- an adder configured to add an input analog signal and a feedback analog signal;
- a loop filter configured to generate a third analog signal obtained by filtering a signal received from the adder;
- a sampling circuit configured to generate a fourth analog signal comprising a discontinuous analog signal by sampling the third analog signal based on a frequency of an operating signal;
- a digital noise coupling circuit configured to convert a quantization error generated in a process of converting the fourth analog signal into a first digital signal into a first digital error signal, to convert a result of performing, in an analog domain, noise shaping on the first digital error signal into a second analog signal, and to convert the first digital error signal that is delayed into a first analog error signal;
- and
- a feedback digital-to-analog converter (DAC) configured to convert a noise-shaped signal, generated by the noise shaping performed on the first digital error signal, into the feedback analog signal and to feed back the feedback analog signal to the adder.
Dependencies are inferred from the claim text.