Influence of Frequency Compensation on the Linearity of Negative Feedback Amplifiers

Hartingsveldt, Koen van; Verhoeven, C.J.M.; Willms, John

doi:10.1109/iscas.2005.1464911

Cited by 4 publications

(5 citation statements)

References 4 publications

(3 reference statements)

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“…† † Phantom zero compensation is chosen here as frequency compensation technique, because it does not reduce the loop gain at higher frequencies, as opposed to pole-splitting (Miller compensation), resistive board-banding, and dominant pole compensation. Hence, it does not (significantly) degrade the input impedance or linearity [18].…”

Section: Synthesis-oriented Double-loop Feedback Modelmentioning

confidence: 99%

Synthesis‐oriented double‐loop feedback model

Hartingsveldt¹,

Verhoeven

Roermund

2017

Circuit Theory & Apps

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SUMMARYThis paper presents a new feedback model that focuses on the synthesis rather than the analysis of feedback amplifiers. First, a single-loop synthesis-oriented feedback model is developed that enables the full synthesis of such amplifiers in a hierarchical and systematic way. This model is subsequently extended to a double-loop synthesis model, so that also feedback amplifiers with a characteristic input or output impedance-employing two feedback loops-can be synthesized through the same systematic approach. That these new models are suitable for synthesis lies in the fact that they map directly to the circuit level, such that the intended, asymptotic behavior as well as the various individual contributors to the deviation from this intended behavior, like finite loop gain, non-ideal input and output impedances of the forward gain block, direct feed-through and attenuations outside the feedback loop(s), are clearly distinguished and can be assigned to the responsible sections of the network. For this purpose, the double-loop synthesis model makes the transfers of the two feedback networks explicitly visible, so that it gives immediate insight in how to design these networks to get the required signal transfer and characteristic impedance.

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Section: Synthesis-oriented Double-loop Feedback Modelmentioning

confidence: 99%

Synthesis‐oriented double‐loop feedback model

Hartingsveldt¹,

Verhoeven

Roermund

2017

Circuit Theory & Apps

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“…Broadband amplifiers generally utilize a feedback method to flatten their power gain response over a broad operating frequency band [2–12]. One of the most general ways of providing feedback is a shunt network, which senses the output voltage and supplies the feedback current to the input current.…”

Section: Optimization For the Broadband Power Amplifiermentioning

confidence: 99%

“…As a specific instance, a typical shunt feedback network, consisting of an inductor ( L f ), a resistor ( R f ), and a capacitor ( C f ) in series, was selected for the simplicity of its circuit and capability to flatten the overall gain response over a wide frequency band [2–12]. The selected feedback network is applied to the open‐loop circuit of a gallium‐nitride high electron mobility transistor (GaN HEMT), as shown in Figure 1(b).…”

Section: Optimization For the Broadband Power Amplifiermentioning

confidence: 99%

“…Broadband power amplifiers have been used in transmitters for military, medical, satellite, broadcasting, and instrumental applications [1–14]. Moreover, emerging broadband wireless communication systems, including various software‐defined or cognitive radio systems, require transmitters having a broader operational bandwidth.…”

Section: Introductionmentioning

confidence: 99%

“…The main performance measures of a broadband power amplifier for continuous wave or constant envelope signal applications are the gain flatness, power‐added efficiency (PAE), output 1‐dB compression point ( P 1dB ), harmonic distortions (HD), and so on. A feedback network is generally adopted to flatten the gain response of the broadband amplifier [2–4]. Hence, the optimization of the feedback network is very important in order for the amplifier to have a good gain flatness.…”

Section: Introductionmentioning

confidence: 99%

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Design of a broadband power amplifier using an optimized feedback network

Kim

Seo

Jeon

et al. 2011

Micro & Optical Tech Letters

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This article presents a systematic design method for ultra broadband power amplifiers using an optimized feedback network. Based on the analysis using the network parameters for the open‐loop circuit and feedback network, a design and optimization procedure was established. To make the gain response as flat as possible throughout the broad operating frequency band, the optimized component values of the feedback network were found using an optimization program which was built based on the least‐mean‐square‐error algorithm in MATLAB. Single‐ended broadband power amplifiers were implemented to verify the optimization results for various target gains, as well as source and load impedance sets. One of the single‐ended amplifiers was selected for use as part of the push–pull power amplifier which includes broad‐band 1:1 transmission line transformers. For the operational bandwidth from 8 to 800 MHz, the ultra broad‐band push–pull power amplifier exhibited a flat gain response of ±0.331 dB from 17.2 dB, a P1dB of more than 40.5 dBm, and high PAE from 26.7 to 45 % at each P1dB point. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2846–2851, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26372

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