Invention Grant
- Patent Title: Drain switched split amplifier with capacitor switching for noise figure and isolation improvement in split mode
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Application No.: US15991980Application Date: 2018-05-29
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Publication No.: US10686409B2Publication Date: 2020-06-16
- Inventor: Kashish Pal , Emre Ayranci , Miles Sanner
- Applicant: pSemi Corporation
- Applicant Address: US CA San Diego
- Assignee: pSemi Corporation
- Current Assignee: pSemi Corporation
- Current Assignee Address: US CA San Diego
- Agency: Jaquez Land Greenhaus LLP
- Agent Bruce W. Greenhaus, Esq.
- Main IPC: H03F1/14
- IPC: H03F1/14 ; H03F1/22 ; H03F3/193 ; H03F1/26 ; H04L27/26 ; H03F3/68 ; H03F1/02

Abstract:
An amplifier circuit configuration capable of processing non-contiguous intra-band carrier aggregate (CA) signals using amplifiers is disclosed herein. In some cases, each of a plurality of amplifiers is an amplifier configured as a cascode (i.e., a two-stage amplifier having two transistors, the first configured as a “common source” input transistor, e.g., input field effect transistor (FET), and the second configured in a “common gate” configuration as a cascode output transistor, (e.g. cascode output FET). In other embodiments, the amplifier may have additional transistors (i.e., more than two stages and/or stacked transistors). The amplifier circuit configuration can be operated in either single mode or split mode. A switchable coupling is placed between the drain of the input FETs of each amplifier within the amplifier circuit configuration. During split mode, the coupling is added to the circuit to allow some of the signal present at the drain of each input FET to be coupled to the drain of the other input FET.
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