Abstract:
A method and apparatus integrate a plurality of input signals. A first integrator (225) integrates a first of the input signals and a second integrator (230) integrates a second of the input signals. A summer (235) is connected to the first and second integrators to then sum the integrated first and second signals and provide a composite integrated signal.
Abstract:
A low current CMOS translator arrangement is disclosed that utilizes a low current inverting stage (302), having a peak current requirement, fed by a constant current source (304) at a supply node that also has a capacitor coupled to it (306). This low current inverter is useful for a number of applications, including generating a sinusoidal signal when it is coupled to a crystal. When one or more are cascaded and coupled to a square wave input signal, the arrangement becomes a low current translator that level-shifts, or translates, the input signal having a first voltage range to a translated square wave output signal having a second voltage range.
Abstract:
An efficient method and apparatus of median filtering includes a memory circuit (305) for holding a list of N data samples (109). A grading circuit (309, 321, 313, 311) identifies a first data sample of the N data samples that has a first metric with a magnitude less than or equal to (N-1)/2, and a second metric with a magnitude greater than or equal to (N-1)/2. The first metric is indicative of a quantity of data samples, exclusive of the first data sample, that have a magnitude less than a magnitude of the first data sample. The second metric is indicative of a quantity of data samples, exclusive of the first data sample, that have a magnitude less than or equal to the magnitude of the first data sample.
Abstract:
An efficient method and apparatus of median filtering includes a memory circuit (305) for holding a list of N data samples (109). A grading circuit (309, 321, 313, 311) identifies a first data sample of the N data samples that has a first metric with a magnitude less than or equal to (N-1)/2, and a second metric with a magnitude greater than or equal to (N-1)/2. The first metric is indicative of a quantity of data samples, exclusive of the first data sample, that have a magnitude less than a magnitude of the first data sample. The second metric is indicative of a quantity of data samples, exclusive of the first data sample, that have a magnitude less than or equal to the magnitude of the first data sample.
Abstract:
An interference dependent adaptive phase clock controller method and system includes synthesis of a signal processing clock signal (307). An interference signal (311) dependent on a phase of the signal processing clock signal is measured, and a phase correction signal (317) is provided dependent thereon. A magnitude of the interference signal is reduced by adjusting the phase of the signal processing clock signal (307) dependent on the phase correction signal (317).
Abstract:
A single ended input differential output amplifier (100) and integrated circuit including an amplifier (100). A pair of load resistors (102, 104) are connected between a supply voltage (Vdd) and differential outputs OUTP and OUTM. An inductor (106) is connected between RFIN and a source bias voltage VBS. A first field effect transistor (FET) (108) is connected between load resistor (102) at output OUTP and inductor (106) at RFIN. A second FET (110) is connected between the second load resistor (104) at output OUTM and the source bias voltage VBS. A gate bias voltage, VBg, is connected to FET (108) through resistor (112) to FET (110). A coupling capacitor (114) is connected between the input RFIN and FET (110). FET (108) may be connected to gate bias voltage VBg through a second gate bias resistor (122).
Abstract:
A fully integrated, adjustable oscillator circuit for use with a crystal is disclosed in which a crystal oscillator, such as a Pierce oscillator, is arranged to utilize a tuning network that includes at least one integrated varactor (voltage-variable-capacitor) as a shunt element for providing at least one type of adjustment of the oscillating signal. More than one type of adjustment can be provided by including a bank of varactors for each of the shunt elements of the tuning network, in which various individual varactors are selected in binary (on-off) fashion to effect digital as well as analog adjustment of the crystal oscillator.
Abstract:
An addressable serial test system employs a serial register with parallel outputs (103). Data is clocked into the serial register via a shift clock signal (105). A decoder (107, 109) is connected to a portion of the shift register's outpus (101) and provides a selection signal (111) dependent on the data clocked into the serial register. A system clock generates a system clock signal (112). A storage element (A-P) includes a clock input (C) coupled to the system clock signal, a data input (D), an output (Q), a load input coupled to the selection signal (LD), and a test data input (TI) coupled to another portion of the shift register's outputs (100). The storage element's output is alternately forced to a state indicative of the test data input by the selection signal and forced to a state indicative of the data input by the system clock. Structure is included to configure the serial register to read the contents of the storage element.
Abstract:
A level detector detects an input signal lever (205). A rectifier (210) receives the input signal and provides a rectified signal (215). A prefilter (220) receives the rectified signal and attenuates high frequency components at frequencies near multiples of a decimation sample rate. The prefilter signal (225) is decimitated by a decimator (230) and low pass filtered by a low pass filter (240) having a passband below the input frequency of the input signal. The level detector can be provided to control a variable gain stage circuit which applies a gain to the input signal based on the level to form a dynamic range compressor or expander.
Abstract:
An addressable serial test system employs a serial register with parallel outputs (103). Data is clocked into the serial register via a shift clock signal (105). A decoder (107, 109) is connected to a portion of the shift register's outpus (101) and provides a selection signal (111) dependent on the data clocked into the serial register. A system clock generates a system clock signal (112). A storage element (A-P) includes a clock input (C) coupled to the system clock signal, a data input (D), an output (Q), a load input coupled to the selection signal (LD), and a test data input (TI) coupled to another portion of the shift register's outputs (100). The storage element's output is alternately forced to a state indicative of the test data input by the selection signal and forced to a state indicative of the data input by the system clock. Structure is included to configure the serial register to read the contents of the storage element.