Systems for a dual-band transceiver that re-uses a lower frequency transmitter to drive a local oscillator (LO) for high frequency circuits are disclosed herein. The need for a LO lineup requiring high frequency and high power is eliminated. The output of a lower frequency band is modified to be used as a LO drive for the higher frequency band transceiver. Using a carrier recovery loop, the system is operable to simultaneously operate in both bands. The result is a solution that eliminate the design of a high performance LO circuits for a higher band of a mmW dual-band system. This significantly reduces the overall complexity of the system. Furthermore, the inventive architecture reduces the design complexity and overall cost to implement dual-band circuit.

An on-off keying (OOK) transmitter and communication method are provided. The OOK transmitter may include a data encoder configured to encode input data into a transmission sequence, a pulse shaper configured to generate pulses based on the transmission sequence, a bi-phase controller configured to generate a control signal to control a random change in phase, between two phases, of a carrier based on the transmission sequence, a bi-phased switch configured to randomly change a phase of the carrier generated by a voltage-controlled oscillator (VCO), based on the control signal, and a power amplifier (PA) configured to generate a transmission signal based on the generated pulses and the carrier with the randomly changed phase. The PA may be a bi-phasing PA, and the bi-phased switch may be included in the bi-phasing PA.

Wireless circuitry can include a radio-frequency amplifier, a mixer configured to receive a local oscillator (LO) signal, and a power detector having an input port coupled to the radio-frequency amplifier and having a separate common mode cancellation input port configured to receive a common mode leakage signal associated with the LO signal. The wireless circuitry can further include a transformer coupled between the radio-frequency amplifier and the mixer. The input port of the power detector may be coupled to a first coil of the transformer. The common mode cancellation input port of the power detector may be coupled to the first coil or to a second coil of the transformer. One or more capacitors can be coupled between the transformer and the common mode cancellation input port of the power detector. Cancelling common mode leakage signals in this way can improve the dynamic range of the power detector.

An apparatus comprising: a first signal path for a first channel operating at a first frequency within a first frequency range; a second signal path for a second channel operating at a second frequency within a second frequency range; control means for controlling frequency-conversion in the second signal path between the second frequency and the first frequency, wherein a magnitude of frequency-conversion is controlled to change in dependence upon a difference between the second frequency and the first frequency.

A method and arrangement for transmitting and receiving RF signals, associated with different radio interfaces of communication systems, employ a direct conversion based transceiver which substantially comprises one receive signal branch and one transmit signal branch. Mixing frequencies of the different systems are generated by a single common by use of an output frequency divider in combination with the synthesizer, and by use of filtering corresponding to a system channel bandwidth by means of a controllable low-pass filter operating at baseband frequency.

A method and apparatus are disclosed for generating a quadrature signal that may be used to modulate and/or demodulate communication signals transmitted between communication devices. A quadrature signal generator may include a control block, a mixer, and a filter. The control block may generate a reference signal and a filter control signal based on an input clock signal. The mixer may generate a mixer output signal based on the input clock signal and the reference signal. The filter, controlled by the filter control signal, may filter the mixer output signal to suppress a band of frequencies within the mixer output signal.

The mixer circuit includes a mixer, an LO matching circuit inserted between an LO signal terminal and a first terminal of the mixer, an IF matching circuit inserted between the IF signal terminal and a second terminal of the mixer, and an RF matching circuit inserted between an RF signal terminal and a third terminal of the mixer. In the RF matching circuit, a reflection characteristic is set such that a minimum value of reflection loss appears on a high-frequency side of the frequency of the LO signal.

In an embodiment, an apparatus includes a first radio frequency (RF) section configured to generate a RF calibration signal based on modulating a calibration signal. The calibration signal comprises an orthogonal code based signal. The apparatus includes a second RF section configured to receive the RF calibration signal and configured to generate a received calibration signal based on demodulating the RF calibration signal. The apparatus includes a calibration section. The received calibration signal and a reference signal associated with the RF calibration signal comprise inputs to the calibration section. The calibration section is configured to determine one or more of gain, baseband delay, or RF delay compensation values, based on the inputs, to calibrate the first RF section.

This disclosure provides systems, methods, and devices for wireless communications that support configurable local oscillator circuitry. In a first aspect, transceiver system includes one or more receive or transmit chains, and a particular chain thereof includes one or more dividers configured to receive a clock signal. The particular chain also includes local oscillator (LO) cross routing circuitry coupled to the one or more dividers and includes a mixer coupled to the LO cross routing circuitry. The particular chain further includes one or more auxiliary mixers coupled to the LO cross routing circuitry, and the LO cross routing circuitry is configured to selectively couple a particular divider of the one or more dividers to the mixer, to at least one auxiliary mixer of the one or more auxiliary mixers, or any combination thereof. Other aspects and features are also claimed and described.

Apparatus, systems, and methods for a transmitter array for enhanced communication systems may be provided. According to an aspect a transmitter array may be provided. The transmitter array may include a plurality of equivalent transmitter units. Each equivalent transmitter unit may include an antenna and a QPSK modulator. Each equivalent transmitter unit may be selectively activatable. In some embodiments, upon activation of a set of equivalent transmitter units selected from the plurality of equivalent transmitter units, a desired modulated output signal is generated. According to another aspect, a method of generating a desired modulated output signal may be provided. The method may include receiving a plurality of local oscillator (LO) signals at a transmitter array. The method may further include selectively activating a set of equivalent transmitter units of the plurality of equivalent transmitter units to generate the desired modulated output signal.