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- Grid_bias abstract "Grid bias is a DC voltage applied to electron tubes (or valves in British English) with three electrodes or more, such as triodes. The control grid (usually the first grid) of these devices is used to control the electron flow from the heated cathode to the positively charged anode. Bias point in small-signal applications is set to minimize distortion and achieve sufficiently low power draw. In high-power applications, biasing is typically set for maximum available output power or voltage, with a secondary target of either low distortion or high efficiency. In a typical voltage amplifier, including power stages of most audio power amplifiers, DC bias voltage is negative relative to cathode potential. Instant grid voltage (sum of DC bias and AC input signal) should never rise above cathode potential to prevent grid-to-cathode currents that overload preceding amplifier stages and may cause severe even-order distortion. High transconductance tubes develop significant grid currents even with small negative bias; in these cases, maximum instant voltage ceiling is lowered to -1.0..-0.5 Volt. High efficiency Class B+ push-pull amplifiers operate at higher bias points (near zero or even positive values). These designs take care of grid currents through the use of cathode followers or interstage transformers easing current load on the driver stages, and deep negative feedback to minimize distortion. High power transmitter tubes (oscillators and modulators) are frequently positively biased to maximize radio frequency output. Distortion is minimized by using band-pass filter loads tuned to the desired radio frequency.Bias voltage is obtained through: An external voltage source (fixed bias) - a battery or a dedicated DC power supply. When the cathode potential is raised above ground (as in cascode circuits), bias voltage is obtained by tapping into main (positive) plate power supply. Automatic bias or self bias - using a cathode resistor to raise cathode potential above grid (tied to ground) and stabilize plate current; Grid leak bias - diverting DC grid current through a high value grid resistor.".
- Grid_bias wikiPageID "2560979".
- Grid_bias wikiPageLength "2505".
- Grid_bias wikiPageOutDegree "22".
- Grid_bias wikiPageRevisionID "632448265".
- Grid_bias wikiPageWikiLink Alternating_current.
- Grid_bias wikiPageWikiLink Amplifier.
- Grid_bias wikiPageWikiLink Anode.
- Grid_bias wikiPageWikiLink Audio_power_amplifier.
- Grid_bias wikiPageWikiLink Band-pass_filter.
- Grid_bias wikiPageWikiLink Biasing.
- Grid_bias wikiPageWikiLink Cascode.
- Grid_bias wikiPageWikiLink Category:Vacuum_tubes.
- Grid_bias wikiPageWikiLink Cathode.
- Grid_bias wikiPageWikiLink Cathode_follower.
- Grid_bias wikiPageWikiLink Class_B_amplifier.
- Grid_bias wikiPageWikiLink Direct_current.
- Grid_bias wikiPageWikiLink Distortion.
- Grid_bias wikiPageWikiLink Interstage_transformer.
- Grid_bias wikiPageWikiLink Modulation.
- Grid_bias wikiPageWikiLink Modulator.
- Grid_bias wikiPageWikiLink Negative_feedback.
- Grid_bias wikiPageWikiLink Oscillation.
- Grid_bias wikiPageWikiLink Oscillator.
- Grid_bias wikiPageWikiLink Push-pull_amplifier.
- Grid_bias wikiPageWikiLink Push–pull_output.
- Grid_bias wikiPageWikiLink Resistor.
- Grid_bias wikiPageWikiLink Transmitter_tube.
- Grid_bias wikiPageWikiLink Vacuum_tube.
- Grid_bias wikiPageWikiLink Volt.
- Grid_bias wikiPageWikiLink Voltage_amplifier.
- Grid_bias wikiPageWikiLinkText "Bias".
- Grid_bias wikiPageWikiLinkText "Grid bias".
- Grid_bias wikiPageWikiLinkText "bias".
- Grid_bias wikiPageWikiLinkText "fixed-bias".
- Grid_bias wikiPageWikiLinkText "grid bias".
- Grid_bias wikiPageWikiLinkText "grid-leak biased".
- Grid_bias auto "yes".
- Grid_bias date "December 2009".
- Grid_bias hasPhotoCollection Grid_bias.
- Grid_bias wikiPageUsesTemplate Template:Mergeto.
- Grid_bias wikiPageUsesTemplate Template:Physics-stub.
- Grid_bias wikiPageUsesTemplate Template:Unreferenced_stub.
- Grid_bias subject Category:Vacuum_tubes.
- Grid_bias hypernym Voltage.
- Grid_bias type Article.
- Grid_bias type Locomotive.
- Grid_bias type Article.
- Grid_bias type Component.
- Grid_bias type Physic.
- Grid_bias comment "Grid bias is a DC voltage applied to electron tubes (or valves in British English) with three electrodes or more, such as triodes. The control grid (usually the first grid) of these devices is used to control the electron flow from the heated cathode to the positively charged anode. Bias point in small-signal applications is set to minimize distortion and achieve sufficiently low power draw.".
- Grid_bias label "Grid bias".
- Grid_bias sameAs Polaryzacja_siatki.
- Grid_bias sameAs m.07n3ls.
- Grid_bias sameAs Q5608606.
- Grid_bias sameAs Q5608606.
- Grid_bias wasDerivedFrom Grid_bias?oldid=632448265.
- Grid_bias isPrimaryTopicOf Grid_bias.