Circuits and methods for multi-phase clock generators and phase interpolators are provided. The multi-phase clock generators include a delay line and multi-phase injection locked oscillator. At each stage of the multi-phase injection locked oscillator, injection currents are provided from a corresponding stage of the delay line. Outputs of the multi-phase injection locked oscillator and provided to mixers which produce inputs to an operational transconductance amplifier which provides feedback to the delay line and the multi-phase injection locked oscillator. The phase interpolator uses a technique of flipping certain input clock signals to reduce the number of components required while still being able to interpolate phase over 360 degrees and to reduce noise.

A method for multiphase frequency to voltage conversion includes generating for each cycle of an oscillating input, one of a plurality of non-overlapping clocks. A respective voltage in proportion to an input frequency of the oscillating input, is generated in response to each of the non-overlapping clocks, with a respective one of a plurality of frequency to voltage converters. Each of the respective voltages is summated to generate a voltage sum proportional to the input frequency.

A mixer for mixing a radio frequency signal is described. The mixer includes a local oscillator input, a phase adjustment module, and at least one mixing channel. The local oscillator input is configured to receive a local oscillator signal. The phase adjustment module is configured to control a phase of the local oscillator signal in order to add a desired amount of delay to the local oscillator signal, thereby generating at least one adapted oscillator signal. The at least one adapted oscillator signal has a desired phase difference compared to the local oscillator signal. The at least one mixing channel includes at least one mixer unit having at least one signal input. The at least one mixing channel is configured to receive the at least one adapted oscillator signal. The at least one mixing channel further is configured to forward the adapted oscillator signal to the mixer unit. The at least one signal input is configured to receive an input signal. The at least one signal input further is configured to forward the input signal to the mixer unit. The mixer unit is configured to mix the at least one adapted oscillator signal with the input signal, thereby generating a mixer output signal.

A device for measuring characteristics of a wafer is provided. The device comprises a first circuit on the wafer and having a first number of parallelly connected oscillators, and a second circuit on the wafer and having the first number of parallelly connected oscillators; wherein a first portion of the second circuit is disconnected from a second portion of the second circuit.

A quadrature phase clock generator includes a tunable polyphase filter and a phase detector. The tunable polyphase filter is configured to receive an input clock signal and generate four quadrature phase clock signals. The phase detector is coupled to receive at least two of the four quadrature phase clock signals and generate a control signal adapted to tune the polyphase filter based on the received quadrature phase clock signals. Further, the phase detector is configured to provide the control signal to the polyphase filter in a feedback loop. Based on the control signal from the phase detector, the tunable polyphase filter generates four tuned quadrature phase clock signals as output phase clock signals.

A quadrature phase clock generator includes a tunable polyphase filter and a phase detector. The tunable polyphase filter is configured to receive an input clock signal and generate four quadrature phase clock signals. The phase detector is coupled to receive at least two of the four quadrature phase clock signals and generate a control signal adapted to tune the polyphase filter based on the received quadrature phase clock signals. Further, the phase detector is configured to provide the control signal to the polyphase filter in a feedback loop. Based on the control signal from the phase detector, the tunable polyphase filter generates four tuned quadrature phase clock signals as output phase clock signals.

A pulse signal compensation circuit of a pulse generator can include a pulse measurement circuit and a compensation generator circuit. The pulse measurement circuit can be configured to receive a plurality of pulse signals and to generate an average duty cycle or pulse overlap signal proportional to the duty cycle or pulse overlap of the plurality of pulses. The compensation generator circuit can be configured to receive the average duty cycle or pulse overlap signal and generate a duty cycle or pulse overlap compensation signal based on the average duty cycle or pulse overlap signal. The compensation signal can be utilized to adjust the duty cycle, amount of positive or negative pulse width overlap, and or the like of the plurality of pulse signals.

A receiver can include a first set of one or more amplifier stages configured to amplify input signals in a plurality of communication bands. The receiver can further include a second and third set of one or more amplifier stages. The second set of one or more amplifier stages can be configured to selectively receive the input signals in the plurality of communication bands amplified by the first set of one or more amplifier stages and to amplify one or more input signals in a first one of the plurality of communication bands. Alternatively, the third set of one or more amplifier stages can be configured to selectively receive the input signals in the plurality of communication bands amplified by the first set of one or more amplifier stages and to amplify one or more input signals in a second one of the plurality of communication bands. A first set of one or more mixers can be configured to receive the input signals in the first communication band amplified by the second set of one or more amplifier stages, to receive one or more local oscillator signals for the first communication band, and to generate a baseband signal from a frequency difference of the signal of the first communication band and the one or more local oscillator signals for the first communication band. A second set of one or more mixers can be configured to receive the input signal in the second communication band amplified by the third set of one or more amplifier stages, to receive one or more local oscillator signals for the second communication band, and to generate a baseband signal of the second communication band.

A multiphase signal generator includes an input port. Furthermore, the multiphase signal generator includes a plurality of phase shifters. Each phase shifter of the plurality of phase shifters is configured to provide an identical phase shift Δφ. At least one phase shifter is connected to the input port. Furthermore, the multiphase signal generator includes a first phase interpolator and at least a second phase interpolator. Each phase interpolator has a respective output terminal. Each phase interpolator is configured to weight a phase of a signal at a respective first input terminal of the phase interpolator with a respective first weighting factor w.sub.i,1 and to weight a phase of another signal at a respective second input terminal of the phase interpolator with a respective second weighting factor w.sub.i,2 to generate an interpolated phase signal at the respective output terminal of the phase interpolator. A first subset of the plurality of phase shifters includes n>1 serially connected phase shifters. The first subset of phase shifters is coupled between the first input terminal and the second input terminal of the first phase interpolator. A different second subset of the plurality of phase shifters includes n serially connected phase shifters. The second subset of phase shifters is coupled between the first input terminal and the second input terminal of the second phase interpolator.

Disclosed is a radar. The radar comprises a transmitter configured to radiate an output signal to an outside. The transmitter includes the phase shifter including a first oscillator configured to generate a first signal, based on a first external signal and a second oscillator configured to generate a second signal, based on a second external signal having a phase different from that of the first external signal, and wherein the first oscillator further receives the second signal to generate the first signal and the second oscillator further receives the first signal to generate the second signal, and configured to generate an oscillation signal of which phase is shifted based on the first signal and the second signal, and the signal amplifier configured to amplify the phase-shifted oscillation signal to generate the output signal.