Active DC directional couplers

Stuckert, P. E.

doi:10.1109/tim.1976.6312355

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…Cherry-Hooper amplifiers are mostly used in applications in digital optical communications [26], but due to the larger bandwidth compared to a standard differential amplifier, differential amplifiers based on the Cherry-Hooper structure are also promising for use in UWB radar systems emitting the M-sequence. The Cherry-Hooper-type amplifiers described in this paper are primarily designed for special types of directional couplers [27,28].…”

Section: Use Of a Cherry-hooper Differential Amplifiermentioning

confidence: 99%

Design and Realization of Ultra-Wideband Differential Amplifiers for M-Sequence Radar Applications

Sokol,

Galajda,

Jurik

2024

Sensors

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Amplification of wideband high-frequency and microwave signals is a fundamental element within every high-frequency circuit and device. Ultra-wideband (UWB) sensor applications use circuits designed for their specific application. The article presents the analysis, design, and implementation of ultra-wideband differential amplifiers for M-sequence-based UWB applications. The designed differential amplifiers are based on the Cherry–Hooper structure and are implemented in a low-cost 0.35 µm SiGe BiCMOS semiconductor process. The article presents an analysis and realization of several designs focused on different modifications of the Cherry–Hooper amplifier structure. The proposed amplifier modifications are focused on achieving the best result in one main parameter’s performance. Amplifier designs modified by capacitive peaking to achieve the largest bandwidth, amplifiers with the lowest possible noise figure, and designs focused on achieving the highest common mode rejection ratio (CMRR) are described. The layout of the differential amplifiers was created and the chip was manufactured and wire-bonded to the QFN package. For evaluation purposes, a high-frequency PCB board was designed. Schematic simulations, post-layout simulations, and measurements of the individual parameters of the designed amplifiers were performed. The designed and fabricated ultra-wideband differential amplifiers have the following parameters: a supply current of 100–160 mA at −3.3 V or 3.3 V, bandwidth from 6 to 12 GHz, gain (at 1 GHz) from 12 to 16 dB, noise figure from 7 to 13 dB, and a common mode rejection ratio of up to 70 dB.

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Section: Use Of a Cherry-hooper Differential Amplifiermentioning

confidence: 99%

Design and Realization of Ultra-Wideband Differential Amplifiers for M-Sequence Radar Applications

Sokol,

Galajda,

Jurik

2024

Sensors

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“…The early uses of transistors to design an active directional coupler are proposed in Pellegrini, 4 Denoth and Pellegrini, 5 and Stuckert. 6 Complementary metal oxide semiconductor (CMOS) directional couplers with good linearity, low noise figure, and small coupling variations are reported in Doan et al 7 Furthermore, because of its on-chip design, the CMOS directional couplers require minimal external connections useful in the portable applications such as, in portable network analyzers, wireless communication applications, RF built-in-self-test (BiST) applications and so on. 8-10 However, the above couplers are higher in cost because of their circuit complexity and higher power requirements (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

“…Most unidirectional couplers are designed using passive elements and transmission lines fabricated on PCBs, hence the area consumption is more in comparison with active couplers. The early uses of transistors to design an active directional coupler are proposed in Pellegrini, 4 Denoth and Pellegrini, 5 and Stuckert 6 . Complementary metal oxide semiconductor (CMOS) directional couplers with good linearity, low noise figure, and small coupling variations are reported in Doan et al 7 Furthermore, because of its on‐chip design, the CMOS directional couplers require minimal external connections useful in the portable applications such as, in portable network analyzers, wireless communication applications, RF built‐in‐self‐test (BiST) applications and so on 8‐10 .…”

Section: Introductionmentioning

confidence: 99%

Broadband CMOS unidirectional coupler using differential mode suppression

Tirmanwar,

Ghosh

2024

Micro & Optical Tech Letters

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This paper describes the design of a broadband, unidirectional coupler designed using complementary metal oxide semiconductor technology. The proposed coupler achieves high isolation by using a differential mode suppressor, employing a differential splitter, followed by a common mode combiner. An intermediary network is used to match all stages to the ports. The coupler, fabricated using United Microelectronics Corporation 180 nm RF/MM technology, achieves better than 15 dB isolation from 0.2 to 1.5 GHz. For this band, it achieves a near flat coupling of 5 dB. The net coupler area is mm2. Such broadband unidirectional couplers can be used in network analyzer testsets.

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Active DC directional couplers

Cited by 2 publications

References 2 publications

Design and Realization of Ultra-Wideband Differential Amplifiers for M-Sequence Radar Applications

Design and Realization of Ultra-Wideband Differential Amplifiers for M-Sequence Radar Applications

Broadband CMOS unidirectional coupler using differential mode suppression

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