A detector circuit in which a change in a detection voltage due to temperature is suppressed is provided. The detector circuit includes a first rectification element having an anode to which an input signal is inputted. A second rectification element has a cathode connected with a cathode of the first rectification element and has an anode connected to an output terminal. A current mirror circuit for supplying a current to the first rectification element and for supplying a current-mirror current of the current to the second rectification element is included in the detector circuit.

A radio frequency (RF) mixer is provided. The RF mixer includes two linear-in-the-amplitude-domain RF channels connected in parallel, with each of the two linear-in-the-amplitude-domain RF channels having of an input RF signal applied equally to each channel. Two controllable gain devices are structured to receive the input RF signal. A local oscillator (LO) communicates with both of the controllable gain devices, with one of the controllable gain devices receiving a signal from the LO directly, and the other controllable gain device receiving a signal from the LO after a phase of the LO signal is reversed by a phase inverter. Finally, an output of each of the linear-in-the-amplitude-domain RF channels is combined to form a common intermediate frequency (IF) output.

A differential mixer and a method which can reduce a leak component of a local oscillation differential signal are provided. A differential mixer includes a mixer core unit to which a high frequency signal and a local oscillation differential signal are inputted and which outputs an intermediate frequency differential signal, a common feedback unit which applies a bias voltage to a signal electrically coupled to the high frequency signal and to which a common voltage is fed back from the intermediate frequency differential signal, and a bias unit that applies a reference voltage to the common feedback unit. The common feedback unit generates the bias voltage based on the reference voltage. The bias unit controls the reference voltage so that a leak component of the local oscillation differential signal is a predetermined value or less at an output end of the intermediate frequency differential signal.

The present disclosure provides an apparatus that includes a first mixer circuit configured to convert between an RF signal and an IF signal based at least in part on an local oscillator (LO) signal. The first mixer circuit is electrically coupled to a first node that is configured to receive the LO signal and a first bias voltage, a second node that is configured to receive the RF signal or the IF signal, and a third node that is configured to provide the IF signal or the RF signal. The apparatus further includes a second mixer circuit electrically coupled to a fourth node configured to receive the LO signal and a second bias voltage, the second node, and the third node. The second bias voltage has a voltage level that is offset from the first bias voltage.

An apparatus is disclosed for mixer biasing with baseband filter common-mode voltage. In an example aspect, the apparatus includes a mixer, a baseband filter, and a bias circuit. The mixer has a mixer transistor that is coupled to a bias node and a baseband node. The baseband filter is coupled to the mixer via the baseband node. The baseband filter is configured to operate with a common-mode reference voltage that is associated with a common-mode voltage applied at the baseband node. The bias circuit is coupled to the baseband filter and the bias node. The bias circuit is configured to receive the common-mode reference voltage from the baseband filter and generate, at the bias node, a bias voltage for biasing the mixer transistor based on the common-mode reference voltage.

An apparatus is disclosed for mixer biasing with baseband filter common-mode voltage. In an example aspect, the apparatus includes a mixer, a baseband filter, and a bias circuit. The mixer has a mixer transistor that is coupled to a bias node and a baseband node. The baseband filter is coupled to the mixer via the baseband node. The baseband filter is configured to operate with a common-mode reference voltage that is associated with a common-mode voltage applied at the baseband node. The bias circuit is coupled to the baseband filter and the bias node. The bias circuit is configured to receive the common-mode reference voltage from the baseband filter and generate, at the bias node, a bias voltage for biasing the mixer transistor based on the common-mode reference voltage.

A change in a detection voltage due to the temperature is suppressed. A detector circuit includes: a first rectification element having an anode to which an input signal is inputted; a second rectification element having a cathode connected with a cathode of the first rectification element and having an anode connected to an output terminal; and a current mirror circuit for supplying a current to the first rectification element, and for supplying a current-mirror current of the current to the second rectification element.

A differential mixer and a method which can reduce a leak component of a local oscillation differential signal are provided. A differential mixer includes a mixer core unit to which a high frequency signal and a local oscillation differential signal are inputted and which outputs an intermediate frequency differential signal, a common feedback unit which applies a bias voltage to a signal electrically coupled to the high frequency signal and to which a common voltage is fed back from the intermediate frequency differential signal, and a bias unit that applies a reference voltage to the common feedback unit. The common feedback unit generates the bias voltage based on the reference voltage. The bias unit controls the reference voltage so that a leak component of the local oscillation differential signal is a predetermined value or less at an output end of the intermediate frequency differential signal.

Methods, systems, and devices for wireless communication are described for enhanced broadband operation of an active mixer. In an example, an apparatus may include an active mixer that converts between radio frequency (RF) signals and intermediate frequency (IF) signals based at least in part on an alternating current (AC) local oscillator (LO) signal, wherein a direct current (DC) current generated within the active mixer is dependent in part on a bias voltage and the AC LO signal. The apparatus may include a mixer biasing circuit that generates the bias voltage for the active mixer, a magnitude of the bias voltage having an inverse relationship to an amplitude of the AC LO signal.

Methods, systems, and devices for wireless communication are described for enhanced broadband operation of an active mixer. In an example, an apparatus may include an active mixer that converts between radio frequency (RF) signals and intermediate frequency (IF) signals based at least in part on an alternating current (AC) local oscillator (LO) signal, wherein a direct current (DC) current generated within the active mixer is dependent in part on a bias voltage and the AC LO signal. The apparatus may include a mixer biasing circuit that generates the bias voltage for the active mixer, a magnitude of the bias voltage having an inverse relationship to an amplitude of the AC LO signal.