A 0.18-$\mu{\hbox {m}}$ CMOS Balanced Amplifier for 24-GHz Applications

Jin, Jun-De; Hsu, Shawn S. H.

doi:10.1109/jssc.2007.914292

Cited by 34 publications

(9 citation statements)

References 16 publications

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“…where l is the physical length of the coupled lines and n is the number of lumped capacitors that realize the required capacitance C d . Practically, to design a section, one needs to iteratively modify the geometry and calculate Equations (7) and (8) to meet the required impedances. The overall coupling will be equal to the inductive coupling coefficient that is not influenced by the compensation.…”

Section: Compensated Three-strip Asymmetric Coupled-line Directional mentioning

confidence: 99%

“…Presently, it is a common practice to implement directional couplers in high frequency integrated circuits [6][7][8][9][10][11]. One frequently used solutions is to integrate branch-line directional couplers [1,7] and couplers designed with a quasi-lumped element approach due to simplicity of their design and physical realization [2][3][4]6,9,12,13]. However, such couplers feature inherently narrow operational bands, resonant reflections, and isolation responses, as well as a large imbalance between transmission and coupling characteristics, all of which limit their applications in broadband circuits and networks.…”

Section: Introductionmentioning

confidence: 99%

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Realization of High-Performance Broadband Quadrature Directional Couplers in UMS PH25 Technology

2019

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The problem of the realization of broadband quadrature directional couplers in UMS (United Monolithic Semiconductors) PH25 is thoroughly investigated. The limitations of the selected technology are discussed with respect to directional couplers' design. It is shown that, in such technologies, two major problems have to be overcome to achieve the high-performance of the resulting integrated couplers, i.e., the realization of appropriate coupling together with appropriate characteristic impedances, and the equalization of inductive and capacitive coupling coefficients that are inherently different in inhomogeneous dielectric structures. Three different solutions that allow for achieving strong coupling in the selected UMS PH25 process were selected and experimentally investigated, showing the possibility of such circuits' realization. In each of the presented integrated couplers, capacitive compensation techniques were applied for coupling coefficients' equalization.

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Section: Compensated Three-strip Asymmetric Coupled-line Directional mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Realization of High-Performance Broadband Quadrature Directional Couplers in UMS PH25 Technology

2019

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“…2. The balanced PA has several advantages: load-variation insensitivity, a flat gain characteristic, enhanced stability, output power combining, a wide bandwidth, and improved input and output matching [12]- [14]. Among the advantages of the balanced PA, load variation immunity is essential for recent mobile wireless communication applications.…”

Section: A Balanced Configurationmentioning

confidence: 99%

“…First, the nominal impedance of the scattering parameter is defined as , and the port impedances are presented as . The reflections of each port are (12) With the assumption that the ports of THRU and CPL are terminated, the reciprocal scattering equations are (13) …”

Section: Appendix Analysis Of Four-port Network Operation Under the Tmentioning

confidence: 99%

“…Because the reflection coefficient of the THRU port and CPL port is 1 when they are terminated to ground using (12), is represented in (24), shown at the top of the next page. Under the terminated-to-ground condition of the THRU and CPL ports, , , and are theoretically zero because the quadrature coupler is in a matched condition.…”

Section: Appendix Analysis Of Four-port Network Operation Under the Tmentioning

confidence: 99%

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A Triple-Mode Balanced Linear CMOS Power Amplifier Using a Switched-Quadrature Coupler

Jeon

Park

Huang

et al. 2012

IEEE J. Solid-State Circuits

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A triple-mode class-AB balanced linear power amplifier (PA) is realized in standard 0.18-m CMOS technology. For the average efficiency enhancement, the triple-mode operation realizes a switched-quadrature coupler with a balanced topology to achieve robust load insensitivity. The PA and RF switches uniquely utilize the isolation port of the switched-quadrature coupler as a signal path in a low-power (LP) mode of operation, and the incorporated output matching network satisfies the condition from the quadrature coupler in the LP mode while providing the necessary load-pull impedance from the PA output side in the high-power (HP) mode. To obtain low loss and high quality factor ( ) of the passive output-combining network, a transformer-based quadrature coupler is implemented using a silicon-based integrated passive device process. With a 3.4-V power supply, the PA transmits a maximum output power of 28.4 dBm with 40.7% of power-added efficiency (PAE) and linear output power up to 26.6 dBm with 35% of the PAE using a 3-GPP WCDMA modulated signal. With the triple-mode operation, a PAE at 16 dBm is enhanced from 11.1% to 17%, and 47 mA of quiescent current is saved. The PA also shows robust operation under 2.5:1 of VSWR condition, achieving 1 dB of the gain variation and less than 3.9 dB of ACLR variation. This work demonstrates the potential of a highly efficient CMOS PA for WCDMA applications.Index Terms-Balanced topology, cascode, CMOS, integrated passive device (IPD), load immunity, multi-mode, power amplifier (PA), quadrature coupler, RF switches, WCDMA.

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Noise of Building Elements

Kroupa

2012

Frequency Stability

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A 0.18-$\mu{\hbox {m}}$ CMOS Balanced Amplifier for 24-GHz Applications

Cited by 34 publications

References 16 publications

Realization of High-Performance Broadband Quadrature Directional Couplers in UMS PH25 Technology

Realization of High-Performance Broadband Quadrature Directional Couplers in UMS PH25 Technology

A Triple-Mode Balanced Linear CMOS Power Amplifier Using a Switched-Quadrature Coupler

Noise of Building Elements

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