An apparatus includes a phased array antenna panel and a plurality of beam former circuits. The phased array antenna panel generally comprises a plurality of antenna elements. The plurality of beam former circuits are each mounted on the phased array antenna panel adjacent to a number of the antenna elements. Each beam former circuit has one or more ports directly coupled to each of the adjacent antenna elements. Each beam former circuit may be configured to generate a plurality of radio-frequency output signals at the ports while in a transmit mode and receive a plurality of radio-frequency input signals at the ports while in a receive mode. Each beam former circuit generally implements a hard-wired address.

A clock generator circuit includes a charge pump unit, a low-pass filter unit, a current-controlled clock generator and a voltage-to-current converter unit. The charge pump unit provides a pump current at an output terminal thereof. The low-pass filter unit is coupled to the output terminal of the charge pump unit, and develops a control voltage at an output terminal thereof based on the pump current. The voltage-to-current converter unit is coupled to the output terminal of the low-pass filter unit, the current-controlled clock generator and the charge pump unit, and provides a control current to the current-controlled clock generator. Each of the low-pass filter unit and the voltage-to-current converter unit includes a resistive element.

Transimpedance amplifiers with feedforward current are provided herein. In certain embodiments, an amplifier system includes a transimpedance amplifier that amplifies an input current received at an input to generate an output voltage at an output. The amplifier system further includes a controllable current source that is coupled to the output of the transimpedance amplifier, and operable to provide a feedforward current that changes in relation to the input current of the transimpedance amplifier. By providing a feedforward current in this manner, gain and speed performance of the transimpedance amplifier is enhanced.

An amplifier for a receiver circuit is disclosed. The amplifier has an input node (V.sub.in) and an output node (V.sub.out). It comprises a tunable tank circuit connected to the output node (V.sub.out), a feedback circuit path connected between the output node (V.sub.out) and the input node (V.sub.in), and a tunable capacitor connected between an internal node of the feedback circuit path and a reference-voltage node. A receiver circuit and a communication apparatus is disclosed as well.

A PA module includes: a multilayer substrate having a ground pattern layer connected to a ground of a power source; amplifier transistors disposed on the multilayer substrate; a bypass capacitor having one end connected to the collector of the amplifier transistor; a first wiring line connecting the emitter of the amplifier transistor and the ground pattern layer to each other; a second wiring line connecting the emitter of the amplifier transistor and the ground pattern layer to each other; a third wiring line connecting the other end of the bypass capacitor and the ground pattern layer to each other; and a fourth wiring line formed between the amplifier transistor and the ground pattern layer and between the bypass capacitor and the ground pattern layer and connecting the first wiring line and the third wiring line to each other.

An apparatus includes a plurality of transmitter channels and a plurality of feedback networks. Each of the plurality of transmitter channels may be coupled to a respective antenna element in a respective group of antenna elements of a phased array antenna. Each of the transmitter channels generally comprises a power amplifier circuit configured to drive the respective antenna element in the respective group of antenna elements to produce and steer a radio-frequency beam. Each of the plurality of feedback networks may be coupled between an output and an input of a respective power amplifier circuit of a respective transmitter channel. Each of the feedback networks generally comprises a resistor and a capacitor connected in series. The respective power amplifier circuit with the feedback network generally maintains a power matching condition with load variation associated with performing beam steering of the radio-frequency beam using the antenna elements of the phased array antenna.

A sensing system with an AC feedback to the non-signal and non-biased terminal of the transducer. An impedance element, such as two anti-parallel diodes, are provided at the amplifier input, and the amplifier gain is negative and has a size sufficient to ensure that the input on the one terminal does not exceed the forward voltage of the diode.

A multi-channel detecting system is disclosed. The multi-channel detecting system includes one or more signal-generating units, one or more detecting units, one or more amplifying units, and a calibration unit; the one or more signal-generating units are configured to provide a plurality of signals, the one or more detecting units are configured to detecting a plurality of signals from the one or more signal-generating units and transmitting through a plurality of calibration samples and generating corresponding quantized values; the one or more amplifying units electrically connected to the one or more detecting units are configured to amplify the quantized values; the calibration unit electrically connected to the one or more amplifying units is configured to calibrate the one or more amplifying units to make amplified quantized values provided by the amplifying units to be equal to one or more specific values.

A trans-impedance amplifier (TIA) includes a first circuit, a second circuit, and a third circuit. Both the first circuit and the second circuit are coupled to a current source, an operational amplifier, and the third circuit. The first circuit is configured to receive a first current, provide a third voltage to the third circuit, perform shape filtering on the first current, and convert the shape filtered first current to a first voltage for output. The second circuit is configured to receive a second current, provide a fourth voltage to the third circuit, perform shape filtering on the second current, and convert the shape filtered second current to a second voltage for output. The third circuit is configured to cooperate with the first circuit and the second circuit in performing shape filtering. The operational amplifier is configured to provide a small-signal virtual ground point to the first circuit.

An apparatus includes a phased array antenna panel and one or more beam former circuits. The phased array antenna panel generally comprises a plurality of antenna elements. The plurality of antenna elements are generally arranged in one or more groups. The one or more beam former circuits may be mounted on the phased array antenna panel. Each beam former circuit is generally coupled to a respective group of the antenna elements. Each beam former circuit generally comprises a plurality of transceiver channels comprising a transmit channel and a receive channel. The phased array antenna panel is generally configured to distribute a control signal to each of the beam former circuits. Each of the transceiver channels is generally configured to switch between a transmit mode and a receive mode in response to the control signal.