# US 9,520,837 B1 · Pulse shaping biasing circuitry > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,837 B1 - Document ID: US9520837B1 - Status: Granted - Kind: B1 - Application number: 15/065,312 - Filed: 2016-03-09 - Granted: 2016-12-13 - Earliest claimed: 2016-03-09 - Assignees: Qorvo US, Inc. - Applicants: RF Micro Devices, Inc. - Inventors: Jinsung Choi; Marcelo Jorge Franco - Web page: https://patentgrep.com/patent/US9520837B1 ## CPC - H03F 1/0222: {by using a signal derived from the input signal} - H03F 1/0261: {with control of the polarisation voltage or current, e.g. gliding Class A} - H03F 1/32: Modifications of amplifiers to reduce non-linear distortion (by negative feedback H03F1/34) - H03F 3/19: with semiconductor devices only - H03F 3/195: in integrated circuits - H03F 3/2173: {of the bridge type} - H03F 3/24: of transmitter output stages - H03F 3/245: {with semiconductor devices only} - H04L 25/03834: {using pulse shaping} - H04L 25/0384: {Design of pulse shapes (pulse shape for impulse radio H04B1/7172)} - H04L 27/367: {using predistortion} - H03F 2200/18: the bias of the gate of a FET being controlled by a control signal - H03F 2200/333: A frequency modulator or demodulator being used in the amplifier circuit - H03F 2200/451: the amplifier being a radio frequency amplifier - H03F 2200/528: the temperature dependence being controlled by referencing to the band gap - H04B 2001/0408: {with power amplifiers} - H03F: AMPLIFIERS - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION ## Abstract Pulse shaping biasing circuitry includes square wave generator circuitry and inverse ramp signal generator circuitry. The square wave generator circuitry is coupled between an input node and signal summation circuitry, and is configured to generate a square wave signal. The inverse ramp signal generator circuitry is coupled in parallel with the square wave generator circuitry and configured to generate an inverted ramp signal based on a supply voltage and a temperature. By generating the inverted ramp signal based on the supply voltage and temperature, the pulse shaping biasing circuitry may compensate an RF power amplifier operated in a pulsed mode such that an error vector magnitude thereof is minimized even as the supply voltage provided to the RF power amplifier and the temperature change. ## Claims ### Claim 1 Pulse shaping biasing circuitry for a radio frequency (RF) power amplifier comprising: square wave signal generator circuitry coupled between an input node and signal summation circuitry, the square wave signal generator circuitry configured to generate a square wave signal; and inverse ramp signal generator circuitry coupled in parallel with the square wave signal generator circuitry between the input node and the signal summation circuitry and configured to generate an inverted ramp signal based on a supply voltage and a temperature. ### Claim 2 (depends on 1) The pulse shaping biasing circuitry of claim 1 further comprising adjustable current amplifier circuitry coupled in series between the inverse ramp signal generator circuitry and the signal summation circuitry and configured to adjust a slope of the inverted ramp signal. ### Claim 3 (depends on 2) The pulse shaping biasing circuitry of claim 2 wherein the inverse ramp signal generator circuitry is configured to generate the inverted ramp signal based on a magnitude of the supply voltage. ### Claim 4 (depends on 3) The pulse shaping biasing circuitry of claim 3 wherein a magnitude of the inverse ramp signal generator signal is dependent on the magnitude of the supply voltage and a temperature of the pulse shaping biasing circuitry. ### Claim 5 (depends on 4) The pulse shaping biasing circuitry of claim 4 wherein the inverse ramp signal generator circuitry comprises: a temperature-dependent current source; an adjustable ramp capacitance including a first terminal and a second terminal coupled to a fixed voltage; a charging switch coupled between the first terminal of the adjustable ramp capacitance and the temperature-dependent current source; a discharging switch coupled in parallel between the first terminal and the second terminal of the adjustable ramp capacitance; and an inverting amplifier coupled between the first terminal of the adjustable ramp capacitance and an output terminal. ### Claim 6 (depends on 5) The pulse shaping biasing circuitry of claim 5 wherein the adjustable ramp capacitance is adjusted based on the magnitude of the supply voltage. ### Claim 7 (depends on 6) The pulse shaping biasing circuitry of claim 6 wherein the adjustable ramp capacitance is a digitally programmable array of capacitors (DPAC). ### Claim 8 (depends on 5) The pulse shaping biasing circuitry of claim 5 wherein the temperature dependent current source is a proportional to absolute temperature (PTAT) current source. ### Claim 9 (depends on 4) The pulse shaping biasing circuitry of claim 4 wherein the adjustable current amplifier circuitry is configured to adjust the slope of the inverted ramp signal based on the supply voltage. ### Claim 10 (depends on 9) The pulse shaping biasing circuitry of claim 9 wherein the adjustable current amplifier circuitry is configured to adjust the slope of the inverted ramp signal based on the temperature. ### Claim 11 A radio frequency (RF) transmitter section for a mobile terminal comprising: a modulator configured to receive a baseband signal and modulate the baseband signal at a desired carrier frequency; RF power amplifier circuitry coupled to the modulator and configured to receive the baseband signal from the modulator and amplify the baseband signal for transmission from an antenna; and pulse shaping biasing circuitry coupled to the RF power amplifier circuitry and configured to linearize a gain response of the RF power amplifier circuitry and comprising: signal summation circuitry coupled to a biasing input of the RF power amplifier circuitry; square wave signal generator circuitry coupled between an input node and the signal summation circuitry, the square wave signal generator circuitry configured to generate a square wave signal; and inverse ramp signal generator circuitry coupled in parallel with the square wave signal generator circuitry between the input node and the signal summation circuitry and configured to generate an inverted ramp signal based on a supply voltage and a temperature of the pulse shaping biasing circuitry. ### Claim 12 (depends on 11) The RF transmitter section of claim 11 wherein the pulse shaping biasing circuitry further comprises adjustable current amplifier circuitry coupled in series between the inverse ramp signal generator circuitry and the signal summation circuitry and configured to adjust a slope of the inverted ramp signal. ### Claim 13 (depends on 12) The RF transmitter section of claim 12 wherein the inverse ramp signal generator circuitry is configured to generate the inverted ramp signal based on a magnitude of the supply voltage. ### Claim 14 (depends on 13) The RF transmitter section of claim 13 wherein a magnitude of the inverse ramp signal generator signal is dependent on the magnitude of the supply voltage and the temperature of the pulse shaping biasing circuitry. ### Claim 15 (depends on 14) The RF transmitter section of claim 14 wherein the inverse ramp signal generator circuitry comprises: a temperature-dependent current source; an adjustable ramp capacitance including a first terminal and a second terminal coupled to a fixed voltage; a charging switch coupled between the first terminal of the adjustable ramp capacitance and the temperature-dependent current source; a discharging switch coupled in parallel between the first terminal and the second terminal of the adjustable ramp capacitance; and an inverting amplifier coupled between the first terminal of the adjustable ramp capacitance and an output terminal. ### Claim 16 (depends on 15) The RF transmitter section of claim 15 wherein the adjustable ramp capacitance is adjusted based on the magnitude of the supply voltage. ### Claim 17 (depends on 16) The RF transmitter section of claim 16 wherein the adjustable ramp capacitance is a digitally programmable array of capacitors (DPAC). ### Claim 18 (depends on 15) The RF transmitter section of claim 15 wherein the temperature dependent current source is a proportional to absolute temperature (PTAT) current source. ### Claim 19 (depends on 14) The RF transmitter section of claim 14 wherein the adjustable current amplifier circuitry is configured to adjust the slope of the inverted ramp signal based on the supply voltage. ### Claim 20 (depends on 19) The RF transmitter section of claim 19 wherein the adjustable current amplifier circuitry is configured to adjust the slope of the inverted ramp signal based on a temperature.