# US 2013/0154747 A1 · Millimeter wave power amplifier > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0154747 A1 - Document ID: US20130154747A1 - Status: Published application - Kind: A1 - Application number: 13/327,479 - Filed: 2011-12-15 - Published: 2013-06-20 - Earliest claimed: 2011-12-15 - Assignees: QUALCOMM Incorporated - Inventors: Saihua Lin; Yongwang Ding; Cheo-Woong Lee - Web page: https://patentgrep.com/patent/US20130154747A1 ## CPC - H03F 1/486: {with IC amplifier blocks} - H03F 1/083: {in transistor amplifiers (H03F1/10 - H03F1/22 take precedence)} - H03F 1/342: {in field-effect transistor amplifiers} - H03F 1/523: {for amplifiers using field-effect devices (H03F1/526 takes precedence)} - H03F 1/565: {using inductive elements} - H03F 3/195: in integrated circuits - H03F 3/601: {using FET's, e.g. GaAs FET's (H03F3/607, H03F3/608 take precedence)} - H03F 2200/135: there being a feedback over one or more internal stages in the global amplifier - H03F 2200/222: A circuit being added at the input of an amplifier to adapt the input impedance of the amplifier - H03F 2200/255: Amplifier input adaptation especially for transmission line coupling purposes, e.g. impedance adaptation - H03F 2200/36: the amplifier comprising means for increasing the bandwidth - H03F 2200/387: A circuit being added at the output of an amplifier to adapt the output impedance of the amplifier - H03F 2200/405: the output amplifying stage of an amplifier comprising more than three power stages - H03F 2200/423: Amplifier output adaptation especially for transmission line coupling purposes, e.g. impedance adaptation - H03F: AMPLIFIERS ## Abstract A millimeter wave power amplifier is disclosed. In an exemplary embodiment, a MM wave power amplifier (PA) includes a plurality of amplifier stages coupled together to receive a MM wave input signal and produce an amplified MM wave output signal, and one or more feedback elements coupled across the amplifier stages, each feedback element coupled across an odd number of the amplifier stages to increase an operating bandwidth of the PA. ## Claims ### Claim 1 An apparatus comprising: a plurality of amplifier stages coupled together to receive a MM wave input signal and produce an amplified MM wave output signal; and one or more feedback elements coupled across the amplifier stages, each feedback element coupled across an odd number of the amplifier stages to increase an operating bandwidth. ### Claim 2 (depends on 1) The apparatus of claim 1, the one or more feedback elements selected to provide a loop gain less than zero. ### Claim 3 (depends on 1) The apparatus of claim 1, each feedback element comprising a fixed resistor having a resistance value set to achieve a desired operating bandwidth. ### Claim 4 (depends on 1) The apparatus of claim 1, each feedback element comprising a variable resistor having a resistance value set to achieve a desired operating bandwidth. ### Claim 5 (depends on 1) The apparatus of claim 1, at least one feedback element comprising a fixed resistor and at least a second feedback element comprising a variable resistor, the fixed resistor and the variable resistor having resistance values set to achieve a desired operating bandwidth. ### Claim 6 (depends on 1) The apparatus of claim 1, the plurality of amplifier stages comprising four amplifier stages and the one or more feedback elements comprising an interleaved double feedback having a first feedback network coupled between an output of a fourth stage and an input of a second stage, and a second feedback network coupled between an output of a third stage and an input of a first stage. ### Claim 7 (depends on 6) The apparatus of claim 6, the first feedback element and the second feedback element selected to provide a loop gain less than zero. ### Claim 8 (depends on 6) The apparatus of claim 6, the first feedback element and the second feedback element comprising fixed resistors having resistance values set to achieve a desired operating bandwidth. ### Claim 9 (depends on 1) The apparatus of claim 1, further comprising an input matching network comprising a coplanar waveguide (CPW) that couples an input at least one amplifier stage to ground to provide electrostatic discharge (ESD) protection. ### Claim 10 (depends on 1) The apparatus of claim 1, further comprising an output matching network comprising a micro strip line (MSL) that couples an output of at least one amplifier stage to ground to provide ESD protection. ### Claim 11 (depends on 1) The apparatus of claim 1, further comprising: a selected feedback element coupled across an even number of amplifier stages; and a phase shifter coupled between the selected feedback element and a selected amplifier stage, the phase shifter configured to introduce a selected amount of phase shift to cause the selected feedback element to act as if coupled around a selected odd number of amplifier stages. ### Claim 12 An apparatus comprising: means for amplifying a MM wave input signal using a plurality of amplifier stages coupled together to produce an amplified MM wave output signal; and means for providing one or more feedback elements coupled across the amplifier stages, each feedback element coupled across an odd number of the amplifier stages to increase an operating bandwidth. ### Claim 13 (depends on 12) The apparatus of claim 12, the means for providing comprising means for providing the one or more feedback elements to provide a loop gain less than zero. ### Claim 14 (depends on 12) The apparatus of claim 12, the means for providing comprising means for providing each feedback element with a resistance value set to achieve a desired operating bandwidth. ### Claim 15 (depends on 12) The apparatus of claim 12, the means for providing comprising means for providing each feedback element with a variable resistance value set to achieve a desired operating bandwidth. ### Claim 16 (depends on 12) The apparatus of claim 12, the means for providing comprising means for providing at least one feedback element comprising a fixed resistance and at least a second feedback element comprising a variable resistance that are set to achieve a desired operating bandwidth. ### Claim 17 (depends on 12) The apparatus of claim 12, the means for amplifying comprising means for amplifying using four amplifier stages and an interleaved double feedback having a first feedback network coupled between an output of a fourth stage and an input of a second stage, and a second feedback network coupled between an output of a third stage and an input of a first stage. ### Claim 18 (depends on 12) The apparatus of claim 12, further comprising means for input matching that provides electrostatic discharge (ESD) protection. ### Claim 19 (depends on 12) The apparatus of claim 12, further comprising means for output matching that provides ESD protection. ### Claim 20 (depends on 12) The apparatus of claim 12, further comprising: means for providing a selected feedback element coupled across an even number of amplifier stages; and means for phase shifting coupled between the selected feedback element and a selected amplifier stage, the means for phase shifting configured to introduce a selected amount of phase shift to cause the selected feedback element to act as if coupled around a selected odd number of amplifier stages.