A calibration circuit (17) for calibrating a frequency synthesizer (10) having a voltage-controlled oscillator (VCO) (15) with a plurality of switched-capacitor arrays (CA1-CAn). The calibration circuit (17) counts a predetermined number of periods of the reference-clock signal (ref_clk) and divide-clock signal (div_clk) of the frequency synthesizer using a fast clock signal (fastclk). The fast-clock signal (fastclk) has a frequency greater than either the reference-clock signal (ref_clk) or the...

A signal at a frequency f.sub.0 is coupled through matching circuitry to the input of a parametric frequency multiplier stage. Non-linearities in this stage generate harmonics of the frequency f.sub.0, including a desired harmonic k.times.f.sub.0, where k=2, 4, 6, 8... . Unique output coupling circuitry presents a high load impedance to the parametric multiplier at the frequency f.sub.0, thereby enhancing harmonic generation, and transforms the impedance to signals of frequency k.times.f.sub.0 a...

An input signal comprising a carrier wave whose frequency may vary is applied to two complementary conductivity type transistors. Two resonant circuits, one tuned to a frequency slightly higher than and the other tuned to a frequency slightly lower than that of the nominal center frequency of the carrier wave are coupled between the respective drain electrodes of these transistors and a circuit node. The voltages developed across these resonant circuits are detected and the detection components ...

In a frequency converter of the type including a polyphase inverter which produces polyphase alternating current inherently containing higher harmonic components, a plurality of polyphase inverters are operated with a predetermined phase difference and the outputs thereof are sythesized by polyphase transformer means so as to eliminate higher harmonic components of relatively low orders, particularly the fifth and seventh higher harmonics.

A first frequency-to-voltage converter develops a first voltage representative of a standard frequency. A variable frequency source is provided to furnish a pulse sequence with constant-duration but variable repetition pulses. A frequency-to-voltage converter receives the pulse sequence to develop a second voltage representative of a total pulse energy generated in the pulse sequence per unit time. The deviation of the second voltage from the first voltage is detected by a comparator to control ...

A frequency converter of the series-capacitor type is made substantially insensitive to changes in output load by providing the same with means for limiting the voltage across the transformer and load capacitor or capacitors thereof to a pre-determined value.

In a transmitter and receiver system, a frequency converter doubles as a transmitter local oscillator, a receiver local oscillator, and a transmitter frequency converter. The present local oscillator is a semi-conductor oscillator such as a gunn diode or IMPAT diode, the DC power supply of which is converted to an intermediate frequency signal. The oscillator is stabilized by self injection locking by a cavity resonator connected to the output of the diode, thus the oscillating frequency is very...

The disclosed amplifier includes first and second gain stages and first and second frequency compensating capacitors. The second gain stage has a first high impedance node coupled to the first gain stage, a second high impedance node, a first circuit coupled between the first and second high impedance nodes, a third high impedance node, and a second circuit coupled between the second and third high impedance nodes. The impedances at the first, second and third high impedance nodes are a function...

A frequency divider for electric timepieces or the like comprising a first block composed of even clock controlled inverters connected in cascade, a second block composed of even clock controlled inverters connected cascade and a clock controlled signal compounding circuit. The final stage output terminal of the first block is connected to a second input terminal of the clock controlled signal compounding circuit.

A frequency detector comprising first, second and third conductive patterns. The first conductive pattern includes an even number of first straight conductive pieces which are disposed radially at regular intervals and sequentially connected in series alternately through first inner periphery conductive pieces and first outer periphery conductive pieces. The second conductive pattern includes an even number of second straight conductive pieces disposed radially at predetermined intervals between...