A unified analysis of MMIC power amplifier stability

Freitag, R.G.

doi:10.1109/mwsym.1992.187971

Cited by 82 publications

(42 citation statements)

References 4 publications

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“…Electromagnetic simulations using IE3D [23] were performed to design the coplanar tapers and verify transmission line models and nonidealities, such as bends and T-junctions. Modal analysis of the combining stage using the method described in [37] showed no sign of odd-mode instability. Parasitic capacitors are extracted on local nodes where the capacitance is not part of the distributed transmission-line structure.…”

Section: Simulation and Layout Methodologymentioning

confidence: 93%

A Wideband 77-GHz, 17.5-dBm Fully Integrated Power Amplifier in Silicon

Komijani

Hajimiri

2006

IEEE J. Solid-State Circuits

111

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Abstract-A 77-GHz, +17.5 dBm power amplifier (PA) with fully integrated 50-input and output matching and fabricated in a 0.12-m SiGe BiCMOS process is presented. The PA achieves a peak power gain of 17 dB and a maximum single-ended output power of 17.5 dBm with 12.8% of power-added efficiency (PAE). It has a 3-dB bandwidth of 15 GHz and draws 165 mA from a 1.8-V supply. Conductor-backed coplanar waveguide (CBCPW) is used as the transmission line structure resulting in large isolation between adjacent lines, enabling integration of the PA in an area of 0.6 mm 2 . By using a separate image-rejection filter incorporated before the PA, the rejection at IF frequency of 25 GHz is improved by 35 dB, helping to keep the PA design wideband.

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Section: Simulation and Layout Methodologymentioning

confidence: 93%

A Wideband 77-GHz, 17.5-dBm Fully Integrated Power Amplifier in Silicon

Komijani

Hajimiri

2006

IEEE J. Solid-State Circuits

111

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“…Because the excitation agrees with one of the matrix eigenvectors, the two admittances are identical, as demonstrated in [11]. This admittance will be renamed Y Te ¼ Y AG1,e ¼ Y AG2,e .…”

Section: I D E T E C T I O N O F O D D -M O D E I N S T a B I L Imentioning

confidence: 95%

“…According to [11], in general, there are N possible modes when N devices are combined. The method to detect mismatch-induced instabilities should consider all of the possible modes, detected through the eigenvalue/eigenvector analysis [11] of the outer tier conversion matrix describing the active subcircuit. Each of them should be tested for the two cases of incommensurable and subharmonic oscillations.…”

Section: V G E N E R a L M E T H O D O L O G Y F O R T H E P R E mentioning

confidence: 99%

“…However, the analysis in [11] assumes a small-signal operation of the amplifier, though, in general, the PA will be in a non-linear regime [10,12] with respect to the input source at f in . Unlike the linearization with respect to the dc solution considered in [11], in the presence of the perturbation at f, the circuit must be linearized about the periodic steady-state periodic solution, which will depend on the input power P in . This linearization should be carried out with the conversion-matrix approach [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Prediction of odd-mode instabilities under output mismatch effects

Rodríguez

Terán

Lucio

2017

Int. J. Microw. Wireless Technol.

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Prediction of odd-mode instabilities under output mismatch effects almudena sua ' rez, franco rami 'rez and sergio sancho A methodology is presented to predict odd-mode instability in power amplifiers under output mismatch effects, as in the case of amplifiers connected to an antenna. This kind of instability is often observed in multi-device configurations, due to their symmetry properties. Unlike the single-ended situation, there is a cancellation of odd multiples of the oscillation frequency at the circuit output, so there is no impact of the load-impedance values at the sideband frequencies. The odd-mode instability only depends on the impedance terminations at the fundamental frequency and its harmonic terms, and can only be detected within the circuit unstable loop, instead of the antenna-connection terminals. The possible unstable modes are related with the eigenvectors of an outer tier conversion matrix accounting for the symmetry properties of the circuit topology. Under sufficient low-pass filtering of the amplifier output network, the analysis parameters can be limited to the magnitude and phase of the reflection coefficient at the fundamental frequency. This analysis involves a computationally efficient graphical technique to detect potential instabilities and a bifurcation-detection method to determine the instability boundaries in the Smith chart. The two main types of instability from periodic regime are considered, respectively associated with incommensurable and subharmonic oscillations. Results have been validated through pole-zero identification and experimental measurements.

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“…A potential push-pull oscillation may arise from the cluster matched power amplifier configuration [29][30][31][32], if proper care is not taken to prevent it. The distinguishing characteristic of the push-pull oscillation is the predominance of the even harmonics, especially the second harmonic.…”

Section: Csmentioning

confidence: 99%