Hybrid Transformers

Sartori, Emanuela

doi:10.1109/tpmp.1968.1135893

Cited by 37 publications

(12 citation statements)

References 3 publications

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“…1 a can be a duplexer, since Rx and Tx paths are connected to the antenna but the ports are isolated. However, the input powers from the two paths are divided into the antenna and R Bal , the intrinsic insertion loss is 3 dB [6]. With some additional losses in real implementation, it has 2–4 dB more loss than an surface acoustic wave (SAW) or film bulk acoustic resonator (FBAR) duplexer, which has about 2.2 dB insertion loss [2].…”

Section: Transformer Duplexer With Two Notches For Wide Isolation Banmentioning

confidence: 99%

Wide‐band duplexer based on electrical balance of hybrid transformer having two notches

et al. 2016

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A tunable transformer duplexer having two notches has been proposed and demonstrated for a broadband operation. The suggested duplexer using GaAs pseudomorphic high electron mobility transistor (pHEMT) technology shows isolations of over 55 dB at the transmitter (Tx) band and over 45 dB at the receiver (Rx) band across 145 MHz bandwidth. The insertion losses are −3.35 and −3.52 dB for the Tx band and the Rx band, respectively, for 500 MHz bandwidth. At all ports, the return losses are under −15 dB. The duplexer is tunable simply by tuning the four components. Although this broadband duplexer has a very compact size with tunable capability, its performance is comparable with the front end module integrated duplexer.

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Section: Transformer Duplexer With Two Notches For Wide Isolation Banmentioning

confidence: 99%

Wide‐band duplexer based on electrical balance of hybrid transformer having two notches

et al. 2016

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“…In the hybrid transformer, all ports can be simultaneously matched and TX and RX ports are electrically isolated from each other [5]. To reduce the ohmic loss of the hybrid transformer, the autotransformer based on a differential inductor is used in the integrated duplexer [4].…”

Section: Proposed Lna With Integrated Tx Leakage Cancellermentioning

confidence: 99%

A CMOS wideband LNA with low-loss integrated TX leakage canceller

Kwon

Choi

2012

IEICE Electron. Express

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Abstract:A CMOS wideband LNA with tunable and low-loss integrated TX leakage canceller is presented. The low RX insertion loss of the TX leakage canceller is achieved by the autotransformer with loss compensating amplifier. The proposed TX leakage canceller is fabricated in 0.13 μm CMOS process. It provides over 55 dB rejection of the TX leakage at the RX port and the notch frequency can be controlled from 866 MHz to 961 MHz using a digitally controlled 4-bit switched capacitor array. The RX insertion loss of the wideband LNA with the TX leakage canceller decreased by 1 dB and the NF is decreased about 0.8 dB compared to that without the compensating amplifier.

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“…1 isolates the RX from the TX over that frequency range where the currents in the autotransformer balance each other in magnitude and phase. In principle, all autotransformer current is in phase and the electrical balance is wideband [2]. In practice, the self-inductance of the autotransformer introduces phase shift and limits the isolation bandwidth substantially.…”

Section: Introductionmentioning

confidence: 99%

An on-chip wideband and low-loss duplexer for 3G/4G CMOS radios

Mikhemar

Darabi

Abidi

2010

2010 Symposium on VLSI Circuits

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A wideband integrated RF duplexer supports 3G/4G bands I, II, III, IV, and IX, and achieves a TX-to-RX isolation of more than 55dB in the transmit-band, and greater than 45dB in the corresponding receive-band across 200MHz of bandwidth. A 65nm CMOS duplexer/LNA achieves a transmit insertion loss of 2.5dB, and a cascaded receiver noise figure of 5dB with more than 27dB of gain, exceeding the commercial external duplexers performance at considerably lower cost and area.

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Hybrid Transformers

Cited by 37 publications

References 3 publications

Wide‐band duplexer based on electrical balance of hybrid transformer having two notches

Wide‐band duplexer based on electrical balance of hybrid transformer having two notches

A CMOS wideband LNA with low-loss integrated TX leakage canceller

An on-chip wideband and low-loss duplexer for 3G/4G CMOS radios

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