摘要:
Circuits and methods that improve the performance of electronic sampling systems are provided. Impedances associated with sampling semiconductor switches are maintained substantially constant during sample states, at least in part, by compensating for encountered input signal variations in order to reduce or minimize signal distortion associated with sampled signals that pass through the sampling switch.
摘要:
Circuits and methods that improve the performance of electronic sampling systems are provided. Impedances associated with sampling semiconductor switches are maintained substantially constant during sample states, at least in part, by compensating for encountered input signal variations in order to reduce or minimize signal distortion associated with sampled signals that pass through the sampling switch.
摘要:
Circuits and methods are provided that compensate for dynamic errors caused by voltage drops across a switch coupled in series with a capacitor in an electrical circuit such as a track-and-hold circuit. In such circuits, the capacitor should provide the same voltage as a signal coupled to the switch, but does not because of the switch voltage drop. The switch can be, for example, a MOSFET or more particularly a CMOS device. Dynamic errors are compensated for by measuring the voltage drop across the switch and then effectively adding the measured voltage drop to a voltage provided by the capacitor.
摘要:
Disclosed is a cell to word buffer for use in a digital TV display radar system in which radar pulse returns are digitized by an analog to digital converter to form pixel data, polar coordinates of the pulse returns are converted to their equivalent X, Y cartesian coordinates by a coordinate converter and the pixel data are stored in an X, Y refresh memory array in accordance with their X, Y coordinates for use in refreshing a TV display. The cell to word buffer allows large offsets in high resolution radar scan converters. The cell to word buffer memory means is located intermediate the coordinate converter and refresh memory for temporarily storing, for each Y location, a plurality of groups of adjacent pixel data and their associated X addresses and for transferring each group of pixel data to its appropriate location in the refresh memory when each group in the buffer memory is filled with pixel data. Further buffer registers of the first in, first out type may be provided intermediate the buffer memory and the refresh memory for smoothing the rate of data transfers therebetween. Also, peak detection means may be provided to avoid loss of pixel data for radar samples near the origin.
摘要:
Circuits and methods that improve the performance of electronic sampling systems are provided. Impedances associated with sampling semiconductor switches are maintained substantially constant during sample states, at least in part, by compensating for encountered input signal variations in order to reduce or minimize signal distortion associated with sampled signals that pass through the sampling switch.
摘要:
Circuits and methods that improve the performance of electronic sampling systems are provided. Impedances associated with sampling semiconductor switches are maintained substantially constant during sample states, at least in part, by compensating for encountered input signal variations in order to reduce or minimize signal distortion associated with sampled signals that pass through the sampling switch.
摘要:
Circuits and methods that improve the performance of electronic sampling systems are provided. Impedances associated with sampling semiconductor switches are maintained substantially constant during sample states, at least in part, by compensating for encountered input signal variations in order to reduce or minimize signal distortion associated with sampled signals that pass through the sampling switch.
摘要:
Circuits and methods that improve the performance of electronic sampling systems are provided. Impedances associated with sampling semiconductor switches are maintained substantially constant during sample states, at least in part, by compensating for encountered input signal variations in order to reduce or minimize signal distortion associated with sampled signals that pass through the sampling switch.
摘要:
Systems and methods for reducing the magnitude of signal dependent capacitance are provided. Capacitance canceling circuitry is operative to generate cancellation capacitance in response to the magnitude of a signal, which may be the same signal that produces the undesired signal dependent capacitance, to at least partially cancel the signal dependent capacitance.