{"id":2846,"date":"2021-11-30T16:35:45","date_gmt":"2021-11-30T16:35:45","guid":{"rendered":"https:\/\/mc.scsiraidguru.com\/?page_id=2846"},"modified":"2024-01-09T21:29:31","modified_gmt":"2024-01-09T21:29:31","slug":"common-emitter","status":"publish","type":"page","link":"https:\/\/mc.scsiraidguru.com\/index.php\/electrical-engineering\/transistors\/common-emitter\/","title":{"rendered":"Common Emitter"},"content":{"rendered":"\t\t
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Here is the common emitter amplifier circuit.\u00a0\u00a0 The components are generic for now.\u00a0 VIN supplies a small current to the base and VCC provides a larger voltage and current to the collector and load.\u00a0\u00a0 The emitter is common to the base and collector, so the name Common Emitter.\u00a0\u00a0 If VIN is a sine wave AC, the output will be a inverted sine wave offset by 180 degrees and amplified.\u00a0\u00a0 High power gain with common emitter amplifier.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Capacitors:
C3 allows the AC signal to bypass RE. Increases the gain of the amplifier.
C1 and C2 blocks DC (VCC) signal and allow AC signal to passthrough<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Resistor:
RB1 and RB2 are a voltage divider.
RC is the resistor on the collector
RE is the resistor on the emitter<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Example:
Vin: 10mV @ 1mA
Vout (RL): 400mV @ 15mA<\/p>

Gain:
AV<\/sub> = Vout \/ Vin: 400m\/10mV = 40
Ai<\/sub> = Iout \/ Iin: 15mA \/ 1mA = 15<\/p>

PIn<\/sub> = 10mV * 1mA = 0.01mW
POut<\/sub> = 400mV*15mA = 6mW
Power Gain: POut<\/sub> \/ PIn<\/sub> = 6mW\/0.01mW = 600 = AV<\/sub> * AI<\/sub><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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This is solved with voltage into base set to 0.\u00a0 This is the quiescent voltage.
\u03b2 =100 is what most set it to.\u00a0 It is a safe number.<\/p>

RB1 and RB2 is the biased part of the circuit.\u00a0\u00a0 The Transistor, RC, and RE are the amplifier part.\u00a0\u00a0 Capacitor is for input and output stages.<\/p>

\u00a0Resistors power limit is 0.25W.\u00a0 We will set PowerRC<\/sub> = 0.2W, you can use this for all resistors based on the spec sheet.
We se Vbias<\/sub> = VRE<\/sub>(Q) + VCB<\/sub>(Q) = 1.2V + 0.7V = 1.9V
to\u00a0 VRE<\/sub>(Q) to 10% of VAMP<\/sub>.\u00a0 10% is just a rule that some use.<\/p>

The base voltage is 0.7V.\u00a0 It is the most common setting for a transistor.\u00a0 RE setting will offset 0.7V being lower.
We will look at setting the voltage for the emitter side: VRE<\/sub> = 10% of Vamp<\/sub> = 12V @ 10% = 1.2V.\u00a0 Vbias<\/sub> = VRE<\/sub>(Q) + VCB<\/sub>(Q) = 1.2V + 0.7V = 1.9V<\/p>

We will look at the calculations for the collector side with this:\u00a0 Set quiescent voltage of VRC<\/sub> to\u00a0 (12V – 1.9V) \/2 = 5.05V..\u00a0\u00a0 You set this number to the half way point based on left over voltage from the base and emitter.<\/p>

PowerRC<\/sub> = V * I
0.2W = 5.05V * I
IRC<\/sub> = 0.0396A or 39.6mA<\/p>

VRC<\/sub> = I * R
5.05V = 39.6mA * R
RC<\/sub> = 127.5\u03a9.\u00a0\u00a0 You can always select your RC<\/sub> and then calculate the power.<\/p>

\u03b2 * IB<\/sub>(Q) = IC<\/sub>(Q)\u00a0 =
IB<\/sub>(Q) = 39.6mA \/ 100 = 0.396mA = 0.000396A<\/p>

IE<\/sub> = IB<\/sub> + IC
<\/sub> =39.6mA + 0.396mA = 39.996mA or 40mA<\/p>

RE<\/sub> = VE<\/sub> \/ IE<\/sub> = 1.2V \/ 0.040 = 30\u03a9<\/p>

Now we look at the other side of the circuit the biased side with resistors RB1 and RB2.\u00a0 Vamp<\/sub>=5V<\/p>

RB1 + RB2 \u2264\u00a0 Vamp<\/sub> \/ ( 10 * IB<\/sub>(Q) )\u00a0 \u2264 5V \/ 10 * 0.000396A ) \u2264 1263\u03a9<\/p>

RB2 would have the same voltage as RE <\/sub>which is 1.9V \/ 5V * 1263\u03a9 = 479.79 or 480\u03a9
RB1 = (5V – 1.9V) \/ 5V * 1263\u03a9 is about 786\u03a9. You can choose less than both RB1 and RB2 as long as the sum is less than 1263\u03a9<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Here is the common emitter amplifier circuit.\u00a0\u00a0 The components are generic for now.\u00a0 VIN supplies a small current to the base and VCC provides a larger voltage and current to the collector and load.\u00a0\u00a0 The emitter is common to the base and collector, so the name Common Emitter.\u00a0\u00a0 If VIN is a sine wave AC, […]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":2701,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"0","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"custom","ocean_center_header_left_menu":"0","ocean_custom_header_template":"7301","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","osh_disable_topbar_sticky":"default","osh_disable_header_sticky":"default","osh_sticky_header_style":"default","osh_sticky_header_effect":"","osh_custom_sticky_logo":0,"osh_custom_retina_sticky_logo":0,"osh_custom_sticky_logo_height":0,"osh_background_color":"","osh_links_color":"","osh_links_hover_color":"","osh_links_active_color":"","osh_links_bg_color":"","osh_links_hover_bg_color":"","osh_links_active_bg_color":"","osh_menu_social_links_color":"","osh_menu_social_hover_links_color":"","footnotes":""},"class_list":["post-2846","page","type-page","status-publish","hentry","entry"],"yoast_head":"\nCommon 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