An X‐band single‐pull class A/B power amplifier in 0.18 μm CMOS

Trinh, Van‐Son; Park, Jung‐Dong

doi:10.1002/mop.31794

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…The shunt RC feedback circuit used in [14] can increase bandwidth, flatten the gain and reduce the distortion. However, the peak gain will be degraded [30]. The neutralization capacitor technique can also achieve stability and increase the bandwidth of PA, and better gain can be maintained.…”

Section: Circuit Architecturementioning

confidence: 99%

A 21.6dBm CMOS power amplifier using a compact high-k output transformer for X-band application

Dou

Huang

Song

et al. 2021

IEICE Electron. Express

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CMOS power amplifier (PA) has advantages in power consumption and integration, while the lower operating voltage limits its output power. An area efficient power combiner needs to be designed to improve the output power of CMOS PA. An X-band integrated PA using 65-nm CMOS bulk technology was presented in this work. The whole PA consists of two differential stages: a one-way drive amplifier and a two-way main amplifier. By employing a compactly designed high-k output transformer, the CMOS PA occupied a small core-area of 0.47×0.57mm 2 , and delivered 21.6 dBm of measured saturated output power with 23.6% of power-added efficiency at 10 GHz from a 1.2-V power supply. Simultaneously, this PA can operate well in 8~15 GHz wideband. key words: silicon CMOS, power amplifier, RF integrated circuit, onchip transformer Classification: Integrated circuits This article has been accepted and published on J-STAGE in advance of copyediting. Content is final as presented.

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Section: Circuit Architecturementioning

confidence: 99%

A 21.6dBm CMOS power amplifier using a compact high-k output transformer for X-band application

Dou

Huang

Song

et al. 2021

IEICE Electron. Express

View full text Add to dashboard Cite

show abstract

“…An important criterion that designers should consider when using a transformer is the amount of power delivered from the source to the load, especially in applications such as WPT [3], [25], and impedance transformation in power amplifiers [1], [2], [4], [21], [22], [29]. We can assess the efficiency of the network with regard to the power from the transducer power gain G T , which is defined as the ratio of the power delivered to load P L to the power available from source P avs [16]:…”

Section: B Impedance Matching With Two Magnetically Coupled Coilsmentioning

confidence: 99%

“…In this study, an onchip transformer was designed in a 0.18 µm CMOS process by using an 8.625 µm thick back-end-of-line (BEOL) stack and a 300 µm thick silicon substrate. The complex dielectric stacks from the BEOL process were simplified into 14 equivalent dielectric layers, each of which was calculated on the basis of a series capacitance approximation verified in previous works [2], [4], [32], [33]. The conductivity of the substrate was set to 10 S/m.…”

Section: Verification Of the Proposed Analysis With An On-chip Tmentioning

confidence: 99%

Theory and Design of Impedance Matching Network Utilizing a Lossy On-Chip Transformer

Trinh

Park

2019

IEEE Access

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In this paper, we present a study on a transformer-based impedance matching network. We use a simplified transformer model comprising two magnetically coupled coils, which are driven by a source and terminated by a load. The formulae of the load and the source impedance for conjugate matching of both sides of the transformer are presented, and a figure of merit is proposed for the evaluation of the power transfer efficiency of the transformer under conjugate matching conditions. Analytical expressions are provided for constructing the widely used transformer network consisting of a resistive load and a parallel tuning capacitor. To verify the proposed work, we examined various on-chip transformers implemented in 0.18 µm CMOS technology. Simulation and measurement results for a matching network synthesized using the aforementioned analytical expressions corresponded well with the result of analysis for operating frequencies up to 72% of the self-resonant frequency of the transformer. The presented results confirm that the proposed analytical formulae based on the simplified transformer model are useful for the design and optimization of transformer-based impedance matching networks in the microwave and millimeter-wave regimes.

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Common-Mode Stability Test and Design Guidelines for a Transformer-Based Push-Pull Power Amplifier

Trinh

Park

2020

IEEE Access

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We report design guidelines for a transformer-based push-pull power amplifier (PA) with a systematic stability test carried out in the complex frequency domain. By detecting the right half-plane zeros of the impedance matrix's determinant, the common-mode (CM) instability in a differential PA were accurately estimated with the established frequencies from the analysis. In the stability test, the parasitic series coupling capacitance of the input transformer and the parasitic inductance from the gate (base) biasing line were identified as the two primary mechanisms of the CM instability in a transformer-based PA contingent on stability. Based on the analysis of the instability mechanisms, useful stabilization methods were proposed and discussed for a robust push-pull PA design with a well-balanced performance. An onboard transformer-based push-pull PA was implemented for the verification purpose, and the effects of parasitic inductance on the stability had been investigated. The simulated and measured results corresponded well with the proposed analysis. INDEX TERMS Common mode, power amplifiers, stability analysis, transformers.

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An X‐band single‐pull class A/B power amplifier in 0.18 μm CMOS

Cited by 4 publications

References 19 publications

A 21.6dBm CMOS power amplifier using a compact high-k output transformer for X-band application

A 21.6dBm CMOS power amplifier using a compact high-k output transformer for X-band application

Theory and Design of Impedance Matching Network Utilizing a Lossy On-Chip Transformer

Common-Mode Stability Test and Design Guidelines for a Transformer-Based Push-Pull Power Amplifier

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