{"id":7839,"date":"2022-05-05T18:18:33","date_gmt":"2022-05-05T12:48:33","guid":{"rendered":"https:\/\/www.goseeko.com\/blog\/?p=7839"},"modified":"2025-06-02T20:47:03","modified_gmt":"2025-06-02T15:17:03","slug":"what-is-the-cb-hybrid-model","status":"publish","type":"post","link":"https:\/\/www.goseeko.com\/blog\/what-is-the-cb-hybrid-model\/","title":{"rendered":"<strong>What is the CB Hybrid Model?<\/strong>"},"content":{"rendered":"\n<p>We use h-parameter model to analyze the Small signal response. Before moving on to the CB (common base) hybrid model we first understand about the hybrid model. We then first derive the general expression of various transistor parameters in terms of hybrid parameters. Later in this article we will derive expressions of the CB (common base) hybrid model.<\/p>\n\n\n\n<p>The hybrid two port model is shown below.<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong><img loading=\"lazy\" decoding=\"async\" width=\"462\" height=\"189\" src=\"https:\/\/lh6.googleusercontent.com\/IO7hOt9BIVx6k2XQMNcp_J5l7Gj8OwW6Sow4IC-47myJufVE8pgQxwhBRLy_rlNj5Yw7CeP2j7vGR6WJEwYn5aZ_ge1WNSx6FV2WnU-q3zE0QsAEbhEhvRFAj6yaTcC0raxOIoDT\"><\/strong><\/p>\n\n\n\n<p>V<sub>i<\/sub> = h<sub>11<\/sub>I<sub>i<\/sub> + h<sub>12<\/sub>V<sub>o<\/sub><\/p>\n\n\n\n<p>I<sub>o<\/sub> = h<sub>21<\/sub>I<sub>i<\/sub> + h<sub>22<\/sub>V<sub>o<\/sub><\/p>\n\n\n\n<p>h<sub>11<\/sub> = h<sub>i<\/sub> = V<sub>i<\/sub>\/I<sub>o<\/sub> for V<sub>o<\/sub> =0&nbsp; [Input resistance]<\/p>\n\n\n\n<p>Reverse voltage gain <\/p>\n\n\n\n<p>h<sub>12<\/sub> = h<sub>r<\/sub> = V<sub>i<\/sub>\/V<sub>o<\/sub> for I<sub>i<\/sub> =0&nbsp;<\/p>\n\n\n\n<p>Then Forward current gain  <\/p>\n\n\n\n<p>h<sub>21<\/sub> = h<sub>f<\/sub> = I<sub>o<\/sub>\/I<sub>i<\/sub> for V<sub>o<\/sub> =0 &nbsp;<\/p>\n\n\n\n<p>Hence,<\/p>\n\n\n\n<p>h<sub>22<\/sub> = h<sub>o<\/sub> = I<sub>o<\/sub>\/V<sub>o<\/sub> for I<sub>i<\/sub> =0 &nbsp; [output admittance]<\/p>\n\n\n\n<p>The hybrid equivalent model is shown below<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh6.googleusercontent.com\/SGfJWIfXDwsJ7He4JwkadxfflNW_bkvHmi1qBkDgoPgLbQABEp7FQpEVsLPN3oFvKHgoZ-CGrL_-qcgcK0ZdNvTeItkelYFg12UAHprzU9cCr8XlRu9mfVqT330w2JT83cPw6R9c\" alt=\"\"\/><figcaption>hybrid Equivalent Model<\/figcaption><\/figure>\n\n\n\n<p>The<a href=\"https:\/\/www.goseeko.com\/blog\/what-are-ce-cb-cc-transistor-configurations\/\"> transistor mode<\/a>l has three terminals with two ports.<\/p>\n\n\n\n<p>Input resistance = h<sub>i<\/sub> <\/p>\n\n\n\n<p>Output conductance= h<sub>o<\/sub><\/p>\n\n\n\n<p>The reverse transfer voltage <\/p>\n\n\n\n<p>h<sub>r<\/sub>= V<sub>i<\/sub>\/V<sub>o<\/sub> <\/p>\n\n\n\n<p>h<sub>f<\/sub>= I<sub>o<\/sub>\/I<sub>i<\/sub> = forward transfer current ratio<\/p>\n\n\n\n<p>The simplified model is shown below<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh3.googleusercontent.com\/mgT8alCg-eqKiMFhV09z6mkdrX8kZXPrejcWNgAFZ3xHSDF1ua8emIPkMPXBRX64ODc5qT6Jv788LhPoJcGu0q5LK37RT7Spf9E5xTf4T3IzrKGr-LPNmEQWRpip46N6aarGL_Ac\" alt=\"\"\/><figcaption>Simplified hybrid Model<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Simplified Hybrid Model parameters<\/h2>\n\n\n\n<p>Finding <strong>current gain A<sub>i<\/sub><\/strong><\/p>\n\n\n\n<p>Applying KCL at the output of above circuit<\/p>\n\n\n\n<p>I<sub>o<\/sub> =I + h<sub>f<\/sub> I<sub>b<\/sub> = V<sub>o<\/sub> h<sub>o<\/sub> + h<sub>f<\/sub> I<sub>b<\/sub><\/p>\n\n\n\n<p>V<sub>o<\/sub> = -I<sub>o<\/sub> R<sub>L<\/sub><\/p>\n\n\n\n<p>Then <\/p>\n\n\n\n<p>I<sub>o<\/sub> = -I<sub>o<\/sub> R<sub>L<\/sub> h<sub>o<\/sub> + h<sub>f<\/sub> I<sub>b<\/sub><\/p>\n\n\n\n<p>I<sub>o<\/sub> (1 + R<sub>L<\/sub> h<sub>o<\/sub>) = h<sub>f<\/sub> I<sub>b<\/sub><\/p>\n\n\n\n<p>A<sub>i<\/sub> = I<sub>o<\/sub>\/ I<sub>b<\/sub> = h<sub>f<\/sub>\/(1 + R<sub>L<\/sub> h<sub>o<\/sub>)<\/p>\n\n\n\n<p>Finding <strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Gain_(electronics)\">Voltage Gain<\/a> A<sub>V<\/sub><\/strong><\/p>\n\n\n\n<p>Applying KVL at input of the above h-model<\/p>\n\n\n\n<p>V<sub>i<\/sub> = h<sub>i<\/sub> I<sub>b<\/sub> + h<sub>r<\/sub> V<sub>o<\/sub><\/p>\n\n\n\n<p>But I<sub>b<\/sub> = (1 + h<sub>o<\/sub> R<sub>L<\/sub>)\/h<sub>f<\/sub><\/p>\n\n\n\n<p>I<sub>o<\/sub> = &#8211; V<sub>o<\/sub>\/R<sub>L<\/sub><\/p>\n\n\n\n<p>Substituting in above equation and solving for V<sub>o<\/sub>\/V<sub>i\u00ad\u00ad<\/sub> we get<\/p>\n\n\n\n<p>A<sub>v<\/sub> = &#8211; h<sub>f<\/sub> RL\/h<sub>i<\/sub> + (h<sub>i<\/sub> h<sub>o<\/sub>&#8211; h<sub>f<\/sub> h<sub>r<\/sub>) R<sub>L<\/sub><\/p>\n\n\n\n<p>Finding <strong>Input Impedance Z<\/strong><strong><sub>i<\/sub><\/strong><\/p>\n\n\n\n<p>V<sub>i<\/sub> = h<sub>i<\/sub> I<sub>b<\/sub> + h<sub>r<\/sub> V<sub>o<\/sub><\/p>\n\n\n\n<p>Then<\/p>\n\n\n\n<p>I<sub>o<\/sub> = &#8211; V<sub>o<\/sub>\/R<sub>L<\/sub><\/p>\n\n\n\n<p>A<sub>i<\/sub> = I<sub>o<\/sub>\/ I<sub>b<\/sub><\/p>\n\n\n\n<p>Since<\/p>\n\n\n\n<p>V<sub>i<\/sub> = h<sub>i<\/sub> I<sub>b<\/sub> &#8211; h<sub>r<\/sub>R<sub>L<\/sub>A<sub>i<\/sub>I<sub>b<\/sub><\/p>\n\n\n\n<p>Hence the input impedance is<\/p>\n\n\n\n<p>Z<sub>i<\/sub> = V<sub>i<\/sub>\/I<sub>b<\/sub> = h<sub>i<\/sub> &#8211; h<sub>r<\/sub>R<sub>L<\/sub>A<sub>i<\/sub><\/p>\n\n\n\n<p>Finding <strong>Output impedance Z<\/strong><strong><sub>o<\/sub><\/strong><\/p>\n\n\n\n<p>It is ratio of output voltage to output current with V<sub>s<\/sub> =0. Then the value of output current becomes<\/p>\n\n\n\n<p>I<sub>o<\/sub> = V<sub>o<\/sub>h<sub>o<\/sub> + h<sub>f<\/sub>I<sub>b<\/sub><\/p>\n\n\n\n<p>I<sub>i<\/sub> = -h<sub>r<\/sub>V<sub>o<\/sub>\/R<sub>s<\/sub> + h<sub>i<\/sub><\/p>\n\n\n\n<p>Z<sub>o<\/sub> = V<sub>o<\/sub>\/I<sub>o<\/sub> = 1\/[h<sub>o<\/sub> \u2013 (h<sub>f<\/sub> h <sub>r<\/sub> \/h<sub>i<\/sub>+ R<sub>s<\/sub>)]<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">CB hybrid Model Parameters<\/h2>\n\n\n\n<p>The common base configuration hybrid model is also shown below. It is the hybrid equivalent of a CB transistor. As we also know input in common base transistors is applied between base emitter terminals. Then the output is collected from the collector emitter junction. Then value of input voltage V<sub>be<\/sub> and output current I<sub>C<\/sub> are as&nbsp;<\/p>\n\n\n\n<p>V<sub>be<\/sub> =h<sub>ib<\/sub> i<sub>b<\/sub> +h<sub>rb<\/sub> V<sub>C<\/sub>&nbsp;<\/p>\n\n\n\n<p>i<sub>e<\/sub> = h<sub>fb<\/sub>i<sub>b<\/sub> + h<sub>ob<\/sub>V<sub>C<\/sub>&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/lh4.googleusercontent.com\/lFPoerNN0Gv_oek_W_sp615A4KFLdpWJ6oGKZYZ9WW2TqsmnbGzIfiKdkgYM2WFaNPUCF-CbgbL9MBb70CNDKRgKxNcXIsI2tLK6W2WqHOAp6isO-_936DzQ9Jf0P4myYCWyta6R\" alt=\"\"\/><figcaption>CB hybrid model<\/figcaption><\/figure><\/div>\n\n\n\n<p>The hybrid expression can also be obtained from the general hybrid formula discussed above by adding a second subscript letter b which commonly stands for base with the h-parameters.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Current Gain<\/h3>\n\n\n\n<p>As derived earlier the value of current gain for CB configuration will be<\/p>\n\n\n\n<p>A<sub>i<\/sub> = -(h<sub>fb<\/sub> \/ (1+ h<sub>ob<\/sub> r<sub>L<\/sub>)<\/p>\n\n\n\n<p>r<sub>L<\/sub>\u2192 AC load resistance.&nbsp;<\/p>\n\n\n\n<p>But r<sub>L <\/sub>= R<sub>c<\/sub>|| R<sub>L<\/sub><\/p>\n\n\n\n<p>Since h<sub>fb<\/sub> is a positive number therefore A<sub>i<\/sub> of a CE amplifier is negative.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Input Resistance<\/h3>\n\n\n\n<p>Then value of resistance at the input terminal in the figure is&nbsp;<\/p>\n\n\n\n<p>R<sub>i <\/sub>= h<sub>ib<\/sub>+ h<sub>rb<\/sub> A<sub>i <\/sub>r<sub>L<\/sub>= h<sub>ib <\/sub>&#8211; ((h<sub>rb<\/sub>h<sub>fb <\/sub>)\/ (h<sub>ob<\/sub> + (1\/r<sub>L<\/sub>)))<\/p>\n\n\n\n<p>The input resistance of the amplifier stage also depends upon the biasing arrangement. Then a fixed biased the stage input resistance is,<\/p>\n\n\n\n<p>R<sub>is<\/sub>= R<sub>i&nbsp;<\/sub><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Voltage Gain<\/h3>\n\n\n\n<p>A<sub>v<\/sub> = A<sub>i <\/sub>&nbsp;r<sub>1 <\/sub>\/R<sub>i<\/sub><\/p>\n\n\n\n<p>We also know that common base amplifiers have positive current gain. Hence, the voltage gain is also positive. Therefore, the output and input are in phase. Then h-parameter is<\/p>\n\n\n\n<p>A<sub>v<\/sub> = h<sub>fb <\/sub>&nbsp;r<sub>L <\/sub>\/(h<sub>ib<\/sub> + \u0394h r<sub>L<\/sub>)<\/p>\n\n\n\n<p>\u0394h = h<sub>ib <\/sub>&nbsp;h<sub>ob <\/sub>&#8211; h<sub>rb <\/sub>&nbsp;h<sub>fb<\/sub><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Output Resistance<\/h3>\n\n\n\n<p>R<sub>o<\/sub> = R<sub>s <\/sub>&nbsp;+ h<sub>ib&nbsp; <\/sub>\/(R<sub>s <\/sub>h<sub>ob<\/sub> + \u0394h)<\/p>\n\n\n\n<p>\u0394h = h<sub>ib <\/sub>&nbsp;h<sub>ob <\/sub>&#8211; h<sub>rb <\/sub>&nbsp;h<sub>fb<\/sub><\/p>\n\n\n\n<p><strong>Overall Voltage Gain<\/strong><\/p>\n\n\n\n<p>A<sub>vs<\/sub> = A<sub>v <\/sub>&nbsp;R<sub>is <\/sub>\/(R<sub>s<\/sub> + R<sub>is<\/sub>)<\/p>\n\n\n\n<p><strong>Overall Current Gain<\/strong><\/p>\n\n\n\n<p>A<sub>is<\/sub> = A<sub>vi<\/sub> R<sub>s <\/sub>\/(R<sub>s<\/sub> + R<sub>is<\/sub>)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>We use small signal transistor model to analyze h-parameters. A transistor can be treated as a two port terminal.<\/p>\n","protected":false},"author":3,"featured_media":7841,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[37],"tags":[],"class_list":["post-7839","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electronics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is the CB Hybrid Model? - Goseeko blog<\/title>\n<meta name=\"description\" content=\"We use small signal transistor model to analyze h-parameters. A transistor can be treated as a two port terminal. 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