Described herein are systems and methods that allow for correcting a residual frequency offset in the GHz frequency range by using low-complexity analog circuit implementations of a broad-band frequency detector that comprises two analog polyphase filters in a dual configuration. Each filter comprises an RC network of cross-coupled capacitors that facilitate filters with opposite passbands and opposite stop-bands. In various embodiments, the outputs of the two filters are combined to obtain power metrics that when subtracted from each other, deliver a measure of the imbalance between the positive and negative halves of a frequency spectrum. Since the measure is substantially proportional to a frequency offset within a linear range spanning 5 GHz or more, the polyphase filters may be used in a broad-band frequency detector that, based on the measure, adjusts the frequency offset.

The present invention provides a filtering circuit comprising a poly phase filter and a quadrature phase detector. The poly phase filter comprises a first path, a second path, a third path and a fourth path. The first path is configured to receive a first input signal to generate a first clock signal. The second path comprising a first adjustable delay circuit is configured to receive the first input signal to generate a second clock signal. The third path comprising a second adjustable delay circuit is configured to receive a second input signal to generate a third clock signal. The fourth path is configured to receive the second input signal to generate a fourth clock signal. The quadrature phase detector is configured to detect phases of these clock signals to generate control signals to control the first adjustable delay circuit and the second adjustable delay circuit.

Described herein are systems and methods that allow for correcting a residual frequency offset in the GHz frequency range by using low-complexity analog circuit implementations of a broad-band frequency detector that comprises two analog polyphase filters in a dual configuration. Each filter comprises an RC network of cross-coupled capacitors that facilitate filters with opposite passbands and opposite stop-bands. In various embodiments, the outputs of the two filters are combined to obtain power metrics that when subtracted from each other, deliver a measure of the imbalance between the positive and negative halves of a frequency spectrum. Since the measure is substantially proportional to a frequency offset within a linear range spanning 5 GHz or more, the polyphase filters may be used in a broad-band frequency detector that, based on the measure, adjusts the frequency offset.

Described herein are systems and methods that allow for correcting a residual frequency offset in the GHz frequency range by using low-complexity analog circuit implementations of a broad-band frequency detector that comprises two analog polyphase filters in a dual configuration. Each filter comprises an RC network of cross-coupled capacitors that facilitate filters with opposite passbands and opposite stop-bands. In various embodiments, the outputs of the two filters are combined to obtain power metrics that when subtracted from each other, deliver a measure of the imbalance between the positive and negative halves of a frequency spectrum. Since the measure is substantially proportional to a frequency offset within a linear range spanning 5 GHz or more, the polyphase filters may be used in a broad-band frequency detector that, based on the measure, adjusts the frequency offset.

The present disclosure relates to a phase shifter including an input port configured to receive a radio frequency (RF) signal; a first output port, a second output port, a third output port, and a fourth output port each configured to output a respective phase-shifted sub-component of the RF signal; a first conductive trace that extends in a first direction, the first conductive trace coupled to the first output port and the second output port; a second conductive trace that extends in the first direction, the second conductive trace coupled to the third output port and the fourth output port; and a first wiper configured to couple the input port to the first conductive trace and the second conductive trace, wherein the first wiper is configured to be slidable in the first direction with respect to the first conductive trace and the second conductive trace.

The present disclosure relates to a phase shifter including an input port configured to receive a radio frequency (RF) signal; a first output port, a second output port, a third output port, and a fourth output port each configured to output a respective phase-shifted sub-component of the RF signal; a first conductive trace that extends in a first direction, the first conductive trace coupled to the first output port and the second output port; a second conductive trace that extends in the first direction, the second conductive trace coupled to the third output port and the fourth output port; and a first wiper configured to couple the input port to the first conductive trace and the second conductive trace, wherein the first wiper is configured to be slidable in the first direction with respect to the first conductive trace and the second conductive trace.

There is provided wireless transmitter that includes a poly phase filter (PPF) configured to receive an input differential intermediate frequency (IF) signal and to generate an in-phase differential IF signal and a quadrature differential IF signal. The wireless transmitter further includes a transformer-based circuit configured to receive an input differential local oscillator (LO) signal and to generate an in-phase differential LO signal and a quadrature differential LO signal based on the input differential LO signal. In addition, the wireless transmitter includes a mixer configured to multiplicatively mix the in-phase differential IF signal with the quadrature differential LO signal to produce a first RF signal component and to multiplicatively mix the quadrature differential IF signal with the in-phase differential LO signal to produce a second RF signal component, the mixer further configured to provide a differential RF signal comprising a (filtered or unfiltered) combination of the first RF signal component and the second RF signal component. Furthermore, the wireless transmitter includes an amplification stage configured to amplify the differential RF signal, the amplification stage comprising a driver stage and a power amplifier stage.

There is provided wireless transmitter that includes a poly phase filter (PPF) configured to receive an input differential intermediate frequency (IF) signal and to generate an in-phase differential IF signal and a quadrature differential IF signal. The wireless transmitter further includes a transformer-based circuit configured to receive an input differential local oscillator (LO) signal and to generate an in-phase differential LO signal and a quadrature differential LO signal based on the input differential LO signal. In addition, the wireless transmitter includes a mixer configured to multiplicatively mix the in-phase differential IF signal with the quadrature differential LO signal to produce a first RF signal component and to multiplicatively mix the quadrature differential IF signal with the in-phase differential LO signal to produce a second RF signal component, the mixer further configured to provide a differential RF signal comprising a (filtered or unfiltered) combination of the first RF signal component and the second RF signal component. Furthermore, the wireless transmitter includes an amplification stage configured to amplify the differential RF signal, the amplification stage comprising a driver stage and a power amplifier stage.

There is provided wireless transmitter that includes a poly phase filter (PPF) configured to receive an input differential intermediate frequency (IF) signal and to generate an in-phase differential IF signal and a quadrature differential IF signal. The wireless transmitter further includes a transformer-based circuit configured to receive an input differential local oscillator (LO) signal and to generate an in-phase differential LO signal and a quadrature differential LO signal based on the input differential LO signal. In addition, the wireless transmitter includes a mixer configured to multiplicatively mix the in-phase differential IF signal with the quadrature differential LO signal to produce a first RF signal component and to multiplicatively mix the quadrature differential IF signal with the in-phase differential LO signal to produce a second RF signal component, the mixer further configured to provide a differential RF signal comprising a (filtered or unfiltered) combination of the first RF signal component and the second RF signal component. Furthermore, the wireless transmitter includes an amplification stage configured to amplify the differential RF signal, the amplification stage comprising a driver stage and a power amplifier stage.

There is provided wireless transmitter that includes a poly phase filter (PPF) configured to receive an input differential intermediate frequency (IF) signal and to generate an in-phase differential IF signal and a quadrature differential IF signal. The wireless transmitter further includes a transformer-based circuit configured to receive an input differential local oscillator (LO) signal and to generate an in-phase differential LO signal and a quadrature differential LO signal based on the input differential LO signal. In addition, the wireless transmitter includes a mixer configured to multiplicatively mix the in-phase differential IF signal with the quadrature differential LO signal to produce a first RF signal component and to multiplicatively mix the quadrature differential IF signal with the in-phase differential LO signal to produce a second RF signal component, the mixer further configured to provide a differential RF signal comprising a (filtered or unfiltered) combination of the first RF signal component and the second RF signal component. Furthermore, the wireless transmitter includes an amplification stage configured to amplify the differential RF signal, the amplification stage comprising a driver stage and a power amplifier stage.