Qualcomm Incorporated

Broadcom Corporation

Yiping Han

Gang Zhang

Yung-Chung Lo

Frederic Bossu

Tsai-Pi Hung

Jae-Hong Chang

Arya Behzad

Rajagopalan Rangarajan

Zhang Jin

Abhishek Jajoo

A method, an apparatus, and a computer program product are provided. The apparatus may be a regulator circuit. The regulator circuit includes a first voltage regulator to regulate a first input voltage to the first voltage regulator, the first voltage regulator including a P-type metal-oxide-semiconductor (PMOS), a second voltage regulator to regulate a second input voltage to the second voltage regulator, and a switch circuit to selectively activate at least one of the first voltage regulator or the second voltage regulator. In one aspect, the second voltage regulator includes an N-type metal-oxide-semiconductor (NMOS). In one aspect, the second voltage regulator comprises a two-stage operational transconductance amplifier (OTA) circuit. In an aspect, the first voltage regulator is coupled to the second voltage regulator.

On-chip dual-supply multi-mode CMOS regulators

A method, an apparatus, and a computer program product are provided. The apparatus may be a regulator circuit. The regulator circuit includes a first voltage regulator to regulate a first input voltage to the first voltage regulator, the first voltage regulator including a P-type metal-oxide-semiconductor (PMOS), and a second voltage regulator to regulate a second input voltage to the second voltage regulator, the second voltage regulator including an N-type metal-oxide-semiconductor (NMOS). In an aspect, the first voltage regulator is coupled to the second voltage regulator.

Certain aspects of the present disclosure provide an inductor-enclosed switchable voltage-controlled oscillator (VCO), for use in a frequency synthesizer of a radio frequency integrated circuit (RFIC), for example. One example apparatus is a frequency synthesizer that generally includes a first VCO circuit comprising a first inductor and a second VCO circuit comprising a second inductor, wherein at least a portion of the first VCO circuit is disposed inside a loop of the second inductor. According to certain aspects, at least a portion of the second VCO circuit is disposed inside a loop of the first inductor.

Inductor-enclosed voltage-controlled oscillators

Disclosed are circuits, techniques and methods for buffering a high frequency signal for transmission over an integrated circuit. In one particular implementation, a plurality of amplification circuits are individually biased for amplifying a signal from a voltage controlled oscillator and/or digitally controlled oscillator to provide a local oscillator signal on a device.

Split-biased current scalable buffer

A phase to digital converter, all digital phase locked loop, and apparatus having an all digital phase locked loop are described herein. The phase to digital converter includes a phase to frequency converter driving a time to digital converter. The time to digital converter determines a magnitude and sign of the phase differences output by the phase to frequency converter. The time to digital converter utilizes tapped delay lines and looped feedback counters to enable measurement of small timing differences typical of a loop tracking process and large timing differences typical of an loop acquisition process. The tapped delay lines permit the measurement of fractions of a reference period and enable lower power operation of the phase to digital converter by reducing requirements on the speed of the reference clock.

Phase to digital converter in all digital phase locked loop

On-chip MOS circuitry couples a communication path between an output stage amplifier and an output port and disables a circuit path between an input amplifier and the output port by creating a high impedance circuit during transmit operations. Alternatively, the circuitry opens the transmit circuit path with an isolated MOSFET and enables the second circuit path by creating an impedance matched circuit. The switch is formed within an isolated region to allow it to float with a signal to avoid breakdown. This floating MOS switch can be used for a variety of other applications in addition to its use as a transmit/receive switch even though formed on the same die as the communication circuitry.

Growing community of inventors

La Jolla, CA, United States of America

Yiping Han