摘要:
A digitally controlled oscillator (DCO) includes a pulse generator for generating a pulse signal upon an edge of a trigger signal, and at least one delay circuit coupled to delay the pulse signal generated by the pulse generator. The pulse generator is coupled to receive one of the delayed pulse signal from the at least one delay circuit and an enable signal as the trigger signal. A digitally controlled varactor (DCV) includes a transistor having a gate, a source, a drain, and a substrate, wherein at least one of the gate, the source, the drain, and the substrate is coupled to receive one of two or more voltages, wherein at least one of the two or more voltages is not a power supply voltage or ground.
摘要:
A voltage generating apparatus including a voltage generator and a current splitter is provided. The voltage generator has an output node, and generates a first output voltage from the output node. The first output voltage rises when the temperature rises and the current flowing from the output end of the voltage generator is fixed. And the first output voltage drops when the temperature is fixed and the current flowing from the output node of the voltage generator rises. The current splitter is used for increasing the current flowing through the current splitter when the temperature rises. Therefore, the rise of the first output voltage of the voltage generator will be restrained, and the temperature compensation can be achieved.
摘要:
A time-to-digital converter apparatus including a delay phase-locked loop, a subtracter, a multi-phase detector and a Vernier detector is disclosed. The delay phase-locked loop herein includes digital delay components for producing counting signals. The multi-phase detector includes digital delay components for producing delay outputs according to the counting signals and thereby detecting a pulse input signal. The Vernier detector includes digital delay components for detecting the remainder of the pulse input signal according to the difference between the delay outputs produced by the subtracter.
摘要:
A programmable delay circuit including a first inverter, a second inverter, a variable resistance unit, and a variable capacitance unit is provided. The first inverter receives a positive-phase received signal, and transmits an anti-phase output signal through an anti-phase output signal line. The second inverter receives an anti-phase received signal, and transmits a positive-phase output signal through a positive-phase output signal line. The variable resistance unit regulates an equivalent resistance between the anti-phase output signal line and the positive-phase output signal line according to M bits in a delay-controlled code. The variable capacitance unit regulates an equivalent capacitance between the anti-phase output signal line and the positive-phase output signal line according to N bits in the delay-controlled code.
摘要:
A DLL-based programmable clock generator using a threshold-trigger delay element and an edge combiner is proposed. A threshold-trigger delay element with full swing complementary output signals consumes no dc power. It exhibits small delay error resulting reduced out jitter. It also increases the linearity of delay time versus control voltage. The circular edge combiner can multiply the input signal at a lower supply voltage. The rise and fall time of output signal are more symmetrical. It also present the multiplication factor of the clock generator can be easy to choose with the increasing of the number of delay elements.
摘要:
A signal transceiver apparatus suitable for a wired signal transceiver system includes a differential signal transmitter, an impendence matching control module and a signal receiver. The signal transmitter has an output terminal which is connected to a transceiver wire. The signal transmitter includes a first impendence tuner and is used to receive a control signal so as to tune impendence of the first impendence tuner according to the control signal. Moreover, the impendence matching control module generates the control signal according to a compare signal and a lock signal. Besides, the signal receiver generates the lock signal and the compare signal according to a compare result between a current flowing through the first impendence tuner and a reference current.
摘要:
An onion waveform generator and a spread spectrum clock generator (SSCG) using the same are provided. The onion waveform generator includes a value generation unit and an accumulating unit. The value generation unit outputs a counting value. The accumulating unit accumulates the counting value to output a waveform value. The accumulating unit switches from an increasing mode to a decreasing mode if the waveform value is a third boundary value, and the accumulating unit switches from the decreasing mode to the increasing mode if the waveform value is a fourth boundary value.
摘要:
A clock generator is illustrated. The clock generator mentioned above includes a multimodulus frequency divider and a delta-sigma modulator. The multimodulus frequency divider is archived by switching the phase thereof. The multimodulus frequency divider increases the operating frequency of the clock generator effectively, and has a characteristic with half period resolution for reducing the jitter of an output clock signal when its spectrum is spread. Besides, the delta-sigma modulator increases the accuracy of the triangle modulation and reduces error of quantization by adding a few components therein. Thus, the clock generator could be expanded to a programmable clock generator.
摘要:
A clock generator is illustrated. The clock generator mentioned above includes a multimodulus frequency divider and a delta-sigma modulator. The multimodulus frequency divider is archived by switching the phase thereof. The multimodulus frequency divider increases the operating frequency of the clock generator effectively, and has a characteristic with half period resolution for reducing the jitter of an output clock signal when its spectrum is spread. Besides, the delta-sigma modulator increases the accuracy of the triangle modulation and reduces error of quantization by adding a few components therein. Thus, the clock generator could be expanded to a programmable clock generator.
摘要:
A clock generator is illustrated. The clock generator mentioned above includes a multimodulus frequency divider and a delta-sigma modulator. The multimodulus frequency divider is archived by switching the phase thereof. The multimodulus frequency divider increases the operating frequency of the clock generator effectively, and has a characteristic with half period resolution for reducing the jitter of an output clock signal when its spectrum is spread. Besides, the delta-sigma modulator increases the accuracy of the triangle modulation and reduces error of quantization by adding a few components therein. Thus, the clock generator could be expanded to a programmable clock generator.