Abstract: An air blowing method-based alcohol sensor and a smart device. The alcohol sensor comprises an alcohol measurement module, an air pressure measurement module, an MCU processor, a circuit substrate, and a housing coveringly arranged on the circuit substrate; the alcohol measurement module transmits a concentration signal thereof to the MCU processor by means of a sampling and amplification circuit module, the air pressure measurement module and the MCU processor are mutually connected and implement transmission of an air pressure signal, and the MCU processor, after performing processing on the concentration signal and the air pressure signal, outputs an alcohol concentration value. The alcohol measurement module and the air pressure measurement module are integrated within the housing.

Abstract: A phase continuity architecture is provided to maintain the phase continuity for a post divider output signal from a post divider that post divides a PLL output signal. A pulse swallower removes a pulse from the PLL output signal responsive to an edge is a divided feedback clock signal. A sampler samples the post divider output signal responsive to a detection of the missing pulse to determine a phase relationship between the post divider output signal and the divided feedback clock signal.

Abstract: An apparatus for generating an oscillating output signal includes an inductive-capacitive (LC) circuit and a current tuning circuit. The LC circuit includes a primary inductor and a varactor coupled to the primary inductor. A capacitance of the varactor is responsive to a voltage at a control input of the varactor. The current tuning circuit includes a secondary inductor and a current driving circuit coupled to the secondary inductor. The current driving circuit is responsive to a current at a control input of the current driving circuit. An effective inductance of the primary inductor is adjustable via magnetic coupling to the secondary inductor, and a frequency of the oscillating output signal is responsive to the effective inductance of the primary inductor and to the capacitance of the varactor.

Abstract: Receiver circuits that can be reconfigured to generate test signals in a wireless device are disclosed. In an exemplary design, an apparatus includes a mixer and an amplifier. The mixer downconverts an input radio frequency (RF) signal based on a local oscillator (LO) signal in a first mode. The amplifier, which is formed by at least a portion of the mixer, amplifies the LO signal and provides an amplified LO signal in a second mode. In another exemplary design, an apparatus includes an amplifier and an attenuator. The amplifier receives and amplifies an input RF signal in a first mode. The attenuator, which is formed by at least a portion of the amplifier, receives and passes an LO signal in a second mode.

Abstract: In one example, a high-speed divider includes two identical pseudo-CML latches and four output inverters. Each latch includes a pair of cross-coupled signal holding transistors. A first P-channel pull-up circuit pulls up on a second output node QB of the latch. A second P-channel pull-up circuit pulls up on a first output node Q of the latch. A pull-down circuit involves four N-channel transistors. This pull-down circuit: 1) couples the QB node to ground when a clock signal CK is high and a data signal D is high, 2) couples the Q node to ground when CK is high and D is low, 3) prevents a transfer of charge between the QB and Q nodes through the pull-down circuit when D transitions during a time period when CK is low, and 4) decouples the QB and Q nodes from the pull-down circuit when CK is low.

Abstract: Certain aspects of the present disclosure provide methods and apparatus for calibrating a transceiver for wireless communications. One example method generally includes configuring a first oscillating signal as an input signal to at least a portion of a receiver (RX) path, calibrating a residual sideband (RSB) of the receiver path using a second oscillating signal as a local oscillating signal for the receiver path, and calibrating an RSB of a transmitter (TX) path by routing an output of the transmitter path to the receiver path, after calibrating the RSB of the receiver path. Another example method generally includes routing an output of a transmitter path to a receiver path, using a first local oscillating signal for the transmitter path, using a second local oscillating signal for the receiver path, and measuring an output of the receiver path as a local oscillator (LO) leakage for the transmitter path.

Abstract: In one example, a high-speed divider includes two identical pseudo-CML latches and four output inverters. Each latch includes a pair of cross-coupled signal holding transistors. A first P-channel pull-up circuit pulls up on a second output node QB of the latch. A second P-channel pull-up circuit pulls up on a first output node Q of the latch. A pull-down circuit involves four N-channel transistors. This pull-down circuit: 1) couples the QB node to ground when a clock signal CK is high and a data signal D is high, 2) couples the Q node to ground when CK is high and D is low, 3) prevents a transfer of charge between the QB and Q nodes through the pull-down circuit when D transitions during a time period when CK is low, and 4) decouples the QB and Q nodes from the pull-down circuit when CK is low.

Abstract: Receiver circuits that can be reconfigured to generate test signals in a wireless device are disclosed. In an exemplary design, an apparatus includes a mixer and an amplifier. The mixer downconverts an input radio frequency (RF) signal based on a local oscillator (LO) signal in a first mode. The amplifier, which is formed by at least a portion of the mixer, amplifies the LO signal and provides an amplified LO signal in a second mode. In another exemplary design, an apparatus includes an amplifier and an attenuator. The amplifier receives and amplifies an input RF signal in a first mode. The attenuator, which is formed by at least a portion of the amplifier, receives and passes an LO signal in a second mode.

Abstract: An apparatus for generating an oscillating output signal includes an inductive-capacitive (LC) circuit and a current tuning circuit. The LC circuit includes a primary inductor and a varactor coupled to the primary inductor. A capacitance of the varactor is responsive to a voltage at a control input of the varactor. The current tuning circuit includes a secondary inductor and a current driving circuit coupled to the secondary inductor. The current driving circuit is responsive to a current at a control input of the current driving circuit. An effective inductance of the primary inductor is adjustable via magnetic coupling to the secondary inductor, and a frequency of the oscillating output signal is responsive to the effective inductance of the primary inductor and to the capacitance of the varactor.

Abstract: Receiver circuits that can be reconfigured to generate test signals in a wireless device are disclosed. In an exemplary design, an apparatus includes a mixer and an amplifier. The mixer downconverts an input radio frequency (RF) signal based on a local oscillator (LO) signal in a first mode. The amplifier, which is formed by at least a portion of the mixer, amplifies the LO signal and provides an amplified LO signal in a second mode. In another exemplary design, an apparatus includes an amplifier and an attenuator. The amplifier receives and amplifies an input RF signal in a first mode. The attenuator, which is formed by at least a portion of the amplifier, receives and passes an LO signal in a second mode.

Abstract: Receiver circuits that can be reconfigured to generate test signals in a wireless device are disclosed. In an exemplary design, an apparatus includes a mixer and an amplifier. The mixer downconverts an input radio frequency (RF) signal based on a local oscillator (LO) signal in a first mode. The amplifier, which is formed by at least a portion of the mixer, amplifies the LO signal and provides an amplified LO signal in a second mode. In another exemplary design, an apparatus includes an amplifier and an attenuator. The amplifier receives and amplifies an input RF signal in a first mode. The attenuator, which is formed by at least a portion of the amplifier, receives and passes an LO signal in a second mode.