Abstract:
One embodiment of the present invention provides a time-to-digital (TDC) converter, comprising: a means for receiving a start signal and a stop signal; a means for generating n number of first delayed start signals (where n is an integer of 2 or more) in 1 time unit increments of delayed start signals; a means for generating a first delayed start signal and an output byte according to the logic level of the stop signal; a coarse TDC which generates a second delayed start signal, which is 1 delayed start signal selected from among the first delayed start signals, that has been shortened to less than the 1 time unit increment; a means for receiving the second delayed start signal generated by the coarse TDC and the stop signal; and a fine TDC for measuring the time difference between the second delayed start signal and the stop signal as a second time unit. According to the present invention, linearity and reliability can be improved by extending the measurement range of a fine time-to-digital converter and ensuring fast operation speed and high accuracy.
Abstract:
A digital synthesizer is described that comprises: a ramp generator (305) configured to generate a signal (307) of frequency control words, FCW, that describes a desired frequency modulated continuous wave; a digitally controlled oscillator (330), DCO, configured to receive the FCW signal (307) and output a DCO signal (335); and a feedback loop that includes a dual time-to-digital converter, TDC, circuit (370) configured to measure a delay between a representation of the DCO signal (345) and a reference signal (364). The TDC circuit (370) comprises a medium-resolution TDC circuit (410) coupled to a fine-resolution TDC circuit (450); and a phase comparator (310) coupled to the ramp generator (305) and configured to compare a phase of the FCW signal (307) output from the ramp generator (305) and a signal fed back from the DCO (330) via the feedback loop and output a N-bit oscillator control signal (315). The medium-resolution TDC circuit (410) comprises a plurality of individual delay cells, where each of the plurality of individual delay cells is coupled to a respective individual fine-resolution TDC circuit. (458).
Abstract:
The invention relates to a method for interference suppression of a scanning process, wherein the method comprises the method steps of scanning an analogue signal (16) using a scanning frequency f (17) and determining whether an interference amplitude (20) is present. The method is characterised in that, when an interference amplitude (20) is present, the scanning frequency f (17) is increased or decreased and the method is restarted using the method step of scanning the analogue signal (16) using the increased or decreased scanning frequency. The invention further relates to a device for carrying out the method.
Abstract:
A time register (300) includes: a pair of inputs (345, 346) coupled to a pair of input clocks (IN 1 , IN 2 ); a pair of tri-state inverters (301, 302) for producing a pair of level signals (V C1 , V C2 ); and a pair of outputs (347, 348) coupled to the level signals (V C1 , V C2 ) for producing a pair of output clocks (OUT 1 , OUT 2 ), wherein the tri-state inverters (301, 302) are responsive to a pair of state signals (S 1 , S 2 ) and the pair of input clocks (IN 1 , IN 2 ) for holding or discharging the level signals (V C1 , V C2 ).
Abstract:
본 발명의 실시 예는 시작신호 및 중지신호를 수신하고, 상기 시작신호를 제1시간단위로 지연시켜 n개(n은 2이상의 정수)의 제1지연시작신호를 생성하며, 상기 제1지연시작신호와 중지신호의 논리레벨에 따른 출력비트를 생성하고, 상기 제1지연시작신호 중 하나의 제1지연시작신호를 상기 제1시간단위보다 짧은 시간단위로 지연시킨 제2지연시작신호를 생성하는 코오스 TDC, 상기 코오스 TDC에서 생성된 제2지연시작신호 및 상기 중지신호를 수신하고, 상기 제2지연시작신호와 중지신호의 시간차를 제2시간 단위로 측정하는 파인 TDC를 포함하는 시간-디지털 변환기를 제공한다. 본 발명에 의해 빠른 동작 속도 및 높은 정확도를 보장함과 파인 시간-디지털 변환기의 측정범위를 확장함으로써, 선형성을 유지하고 신뢰성을 향상시킬 수 있다.
Abstract:
A robust and fast background calibration technique for correction of time-interleaved ADC offset, gain, bandwidth, and timing mismatches is proposed. The technique combines the use of a calibration signal and a reference ADC. The calibration signal enhances robustness and makes the technique independent of the input signal's statistics. The reference ADC speeds up convergence and enables the use of a small amplitude calibration signal that does not significantly reduce the input signal dynamic range. The calibration signal can be subtracted or filtered from the ADC output and is therefore invisible to the ADC user.
Abstract:
Methods and devices herein relate to a method for estimating bandwidth mismatch in a time-interleaved A/D converter. An example method includes precharging terminals of capacitors to a first state in each channel of a plurality of channels and sampling a reference analog input voltage signal (Vref) applied via a first switchable path whereby the sampled input voltage signal is received at first terminals of the capacitors. The method further includes setting the second terminals of each channel to a second state. The method also includes applying the reference analog input voltage signal to the first terminals via a second switchable path, and thereby creating on the first terminals a non-zero settling error. The method additionally includes quantizing the settling error to obtain an estimate of the non-zero settling error. The method yet further includes comparing the estimates of the non-zero settling errors and deriving an estimation of the bandwidth mismatch.