## Blog

Learn something new with our collection of blog posts centered around various topics on PSpice® technology.

## Know How Your Circuit Works!- Using Sensitivity Analysis In PSpice (Part 1 of 4)

I was thinking of writing a series of blogs showcasing what all ammunitions a circuit designer may need to deal with any complex circuits today. So, here's the first one.

The first thing a designer has to be sure of is to thoroughly understand/ know their circuit. This is first of the series of 4 blogs where I will apply the PSpice Advanced Analysis capabilities that can be used to understand any circuit.

For this blog, I will use an RF Amplifier circuit as an example. However, these advanced tool capabilities can be applied to any other circuit of your choice.

Use this blog as a reference and apply these capabilities on your own circuit design!

## Performing Sensitivity Analysis on a RF Amplifier circuit in PSpice

When in college, books tell you everything about your circuit. You already know which components are critical in your designs. But, what about when you enter an industry? You have completely new designs that you build or come across and you need to know which components are critical for your goals.

According to the tolerance values specified, the Sensitivity Analysis in OrCAD simulates circuit performance as those components parametric values change. It gives you an ordered list of critical components in your design. As a result, this allows you to save money by loosening the tolerance on those components which are not very critical for your goals and selecting cheaper ones.

Let's look at why a circuit designer would perform Sensitivity analysis on his/ her circuit design.

## Importance of Sensitivity Analysis:

A sample RF Amplifier circuit for this blog is shown in Figure 1 (below). We will perform Sensitivity Analysis on it and understand the results.

Figure 1: Sample RF Amplifier circuit

The main parameters to be considered for any RF circuit are:

• Bandwidth
• Gain
• O/P Noise Level
• I/P Noise Level

So, how do you perform Sensitivity Analysis? What are the steps to be followed? Let's look at the flow...

## Flow for performing Sensitivity Analysis:

You have got to set your circuit up for the Sensitivity Analysis (below)

## Sensitivity Analysis Circuit Setup:

Figure 2: Assign tolerances to the RF Amplifier Circuit

Sensitivity analysis varies the values of components based on the tolerance value specified and shows you the effect of those components on the measurement goals. In Figure 2, note that we have assigned 10% global tolerances to all capacitors and resistors in our circuit. Next, perform Sensitivity Analysis on this circuit and let the tool do the magic. The output window would look like Figure 3.

Figure 3: Output window after performing Sensitivity Analysis

The components are listed in order of their effect on the measurement goal. The most critical component for a measurement are listed at top of the list. In Figure 3, I have selected Bandwidth as the main goal and note that it is most dependent on the value of R4 component.

Sensitivity Analysis in OrCAD identified all the key components in the design based on the goals specified.

## Key Components Identified:

Now, that we've identified key components in the design, let’s set some goals for Bandwidth, Gain, Output level noise and Noise Figure for our sample circuit and let the Optimizer do the work! For example, you can set your goals for Gain to be greater than 9 dB and Bandwidth to be greater than 200 MHz etc.

Blog 2 of this series will be posted shortly where we will see the use of Optimizer on the same circuit.

Video reference: Leverage PSpice Advanced Analysis to reduce design cost, improve design reliability, engineer's productivity and manufacturing yield.

Try the OrCAD free version yourself and start applying these Advanced Analysis capabilities on one of the many demo designs available in there.

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#### Biệt thự vườn 1 tầng

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#### Tiệc cưới Thiên Trang

Tiệc cưới Thiên Trang. 商業建築であろうと住宅建築であろうと、最新のテクノロジーをあらゆるプロジェクトに適用してプロジェクトをシームレスに計画および設計し、クラス最高の建築管理ソリューションを一般に提供します。

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#### Tiệc cưới Duy Tiên

Tiệc cưới Duy Tiên. プロセスは最も効果的な方法で実行され、正確なコスト見積もりが行われます。

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Biệt thự 3 tầng Hà Nam. 建築エンジニアリングサービスを提供する企業が設計～施工段階でミスをすると、正確な施工ができなくなります。

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Dinh thự 3 tầng. したがって、住宅または商業ビルの基礎は建築家の手にあると言えます。

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#### Dự án nổi bật

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Dự án nổi bật #2. 経験豊富な若い建築家のチームと大規模な製造工場には最新の機械が投資されています。

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Dự án nổi bật #3. A Dong は、エレガントで快適、機能性が高く快適で、高品質の家具が合理的に配置され、同時に顧客ごとに独特のスタイルと印象を生み出すアパートメントを自信を持って設計します。

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#### Dự án nổi bật #4

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#### Nội thất tại Hải Phòng

Nội thất tại Hải Phòng. このタイプに適しています。

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#### Nội thất tại Hà Nội

Nội thất tại Hà Nội: タウンハウスは住むのに最適な場所であり、人々が近くに住むことができるため、スペースをあまり占有せずに環境への影響を軽減するのに役立ちます。

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#### Nội thất tại Quảng Ninh

Nội thất tại Quảng Ninh: タウンハウスの欠点は、幅が狭く、長さが非常に長いことです。

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#### Nội thất tại TP. Hồ Chí Minh

Nội thất tại TP. Hồ Chí Minh: 多くの場合、内も外も同じように見えるため、目立ちたい人や人と違うことを好む人にとってはイライラする可能性があります。

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#### Nội thất tại Đà Nẵng

Nội thất tại Đà Nẵng: 夢のタウンハウスインテリアを実現するためのアドバイスが必要な場合。

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#### Nội thất tại Vĩnh Phúc

Nội thất tại Vĩnh Phúc: タウンハウス向けのインテリア デザインのアイデアが満載の A DONG をお選びください。

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#### Nội thất tại Hà Nam

Nội thất tại Hà Nam: 当社の才能ある建築家が必要とする最新のデザイントレンドで、あなたの家を明るく大胆に作りましょう。

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Nội thất tại Hải Dương: DONG は、ほとんどの人が最初に目にする家をデザインするのに役立ちます。

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#### Nội thất tại Hòa Bình

Nội thất tại Hòa Bình: 誰もがあなたを非常に印象的でユニークだと言うでしょう。

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#### Nội thất tại Nam Định

Nội thất tại Nam Định: 現代のトレンドにマッチし、タウンハウスの居住スペースを効果的に増やす快適な空間を作り出します。

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Nội thất căn hộ chung cư: A DONG Furnitureの生産は、会社の創設者の伝統的な事業です。

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#### Nội thất nhà phố

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#### Nội thất biệt thự, Penthouse, Duplex

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#### Nội thất biệt thự, Penthouse, Duplex #2

Nội thất biệt thự, Penthouse, Duplex #2: 私たちは毎日可能な限り最良の価格を提供し、迅速な発送、設置、配達サービスを設定します。

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#### Nội thất khách sạn

Nội thất khách sạn: 伝統的なものからモダンなものまで、アジアの職人による手作りの無垢材家具を提供しています。

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#### Nội thất tiệc cưới, văn phòng, nhà hàng

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#### Nội thất cổ điển

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#### Nội thất cổ điển #2

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#### Nội thất hiện đại

カスタマーサービスは私たちにとって非常に重要です。Nội thất hiện đại