摘要:
An electronic circuit includes a bandgap reference circuit and a start-up circuit for starting up the bandgap reference circuit. The bandgap reference circuit includes at least one electric path having a semiconductor diode and a resistor connected in series with said semiconductor diode, wherein the voltage across the resistor is proportional to the absolute temperature of the semiconductor diode. The start-up circuit assists starting up the bandgap reference circuit until the voltage across the resistor reaches a preset threshold voltage, and the start-up circuit turns off automatically when the voltage across the resistor has reached the threshold voltage.
摘要:
A circuit arrangement for generating switch-on signals for driving track-and-hold elements of an analog-to-digital converter operating with interleaved timing comprises a first input for inputting a common reference clock signal, at least one window device for generating clock signals which are interleaved with respect to one another in terms of timing and whose respective time windows in which the respective of the clock signals has a first logic level are derived from the reference clock signal, and at least one gate device for generating a switch-on signal. The gate device is connected downstream of the window device and combines logically the reference clock signal with a respective of the clock signals and with a further information item so that a time window of the switch-on signal is at least longer than the window of the reference clock signal.
摘要:
In accordance with an embodiment, a method of driving switches includes sensing a control node of a first switch, sensing a control node of a second switch, and driving the control node of the first switch to a first active state after the control node of the second switch transitions to a second active state. The method also includes driving the control node of the second switch to a second inactive state after the control node of the first switch transitions to a first inactive state. Driving the control node of the first switch is based on sensing the control node of the second switch, and driving the control node of the second switch is based on based on sensing the control node of the first switch.
摘要:
In accordance with an embodiment, a circuit for driving a switch includes a driver circuit. The driver circuit includes a first output configured to be coupled to a gate of the JFET, a second output configured to be coupled to a gate of the MOSFET, a first power supply node, and a bias input configured to be coupled to the common node. The switch to be driven includes a JFET coupled to a MOSFET at a common node.
摘要:
The disclosed DC-to-DC converter circuit comprises a tracking ADC configured to drive a DC-to-DC converter. In particular, the tracking ADC is configured to receive an analog feedback voltage from the output of the DC-to-DC converter. The analog feedback voltage is compared to an analog reference voltage and based upon the comparison a digital ADC output signal, comprising a digital code, is generated to drive the DC-to-DC converter. The digital ADC output signal is received by the DC-to-DC converter, which is configured to compare the digital code to a target code value. Based upon this comparison, the digital signal drives operation of the DC-to-DC converter by indicating whether the output of the DC-to-DC converter will be adjusted (e.g., by telling the DC-to-DC converter to increase its output voltage, to decrease its output voltage, or to keep its output voltage the same). Other systems and methods are also disclosed.
摘要:
An electronic circuit includes a bandgap reference circuit and a start-up circuit for starting up the bandgap reference circuit. The bandgap reference circuit includes at least one electric path having a semiconductor diode and a resistor connected in series with said semiconductor diode, wherein the voltage across the resistor is proportional to the absolute temperature of the semiconductor diode. The start-up circuit assists starting up the bandgap reference circuit until the voltage across the resistor reaches a preset threshold voltage, and the start-up circuit turns off automatically when the voltage across the resistor has reached the threshold voltage.
摘要:
A signal processing system allows reconstruction of a non-uniformly sampled analog signal including sampling an analog signal at a sampling period of resulting in a quantized non-uniformly sampled signal. The non-uniformly sampled signal includes a sampled signal and an amplitude error between a signal sampled with the equidistant sample period and the non-uniformly sampled signal. A reconstructed amplitude error is determined through the time offset and the non-uniformly sampled signal, and is subtracted from the non-uniformly sampled signal. The signal processing system may be implemented in an electrocardiogram monitoring device or a mobile phone device.
摘要:
In the case of a sample-and-hold device a holding condenser is fed with an input voltage via a controllable sampling switch. To improve the transient characteristic of the sampling switch this is fed with an adjusting signal of a controller, which regulates the conductance of a mirror switch with essentially identical features as the sampling switch to an ideal value, whereby the mirror switch is exposed to the same operating conditions as the sampling switch. In order to reduce distortions of the sample-and-hold device, a voltage step-up condenser can be looped into the activating path, which feeds the adjusting signal to the control inputs of the sampling switch or the mirror switch, before which was previously loaded with an auxiliary voltage.