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7A11: Difference between revisions
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In includes a permanently attached FET probe. The bandwidth of a 7A11 in a [[7904]] is 250 MHz. | In includes a permanently attached FET probe. The bandwidth of a 7A11 in a [[7904]] is 250 MHz. | ||
Regarding the 7A11, its designer John Addis says: | Regarding the 7A11, its designer [[John Addis]] says: | ||
<blockquote> | <blockquote> | ||
The 7A11 input capacitance is 5.8 pF from 5 mV/Div to 50 mV/Div, goes down to 3.4 pF from | The 7A11 input capacitance is 5.8 pF from 5 mV/Div to 50 mV/Div, goes down to 3.4 pF from | ||
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The [[7A16]] (single channel plugin) was also 150 MHz, but that was a year later. | The [[7A16]] (single channel plugin) was also 150 MHz, but that was a year later. | ||
Then the [[7904]] came out in late 1971. That made the 7A11 a 250 MHz plugin (for $950). | Then the [[7904]] came out in late 1971. That made the 7A11 a 250 MHz plugin (for $950). | ||
The 7A16 was then 225 MHz (for $625). The 7A16 disappeared rapidly and became the 7A16A, | The [[7A16]] was then 225 MHz (for $625). The 7A16 disappeared rapidly and became the [[7A16A]], | ||
still 225 MHz in 1973. | still 225 MHz in 1973. | ||
</blockquote> | </blockquote> | ||
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</blockquote> | </blockquote> | ||
<blockquote> | <blockquote> | ||
The star-crossed 7A12, which was supposed to be the dual trace flagship of the original plugins, | The star-crossed [[7A12]], which was supposed to be the dual trace flagship of the original plugins, | ||
was only 105 MHz, not the hoped-for 150 MHz. That was partially due to the fact that it used the | was only 105 MHz, not the hoped-for 150 MHz. That was partially due to the fact that it used the | ||
existing Tek IC process (about 1 GHz). The HP IC process was about 3 GHz. The 7A11 used discrete | existing Tek IC process (about 1 GHz). The HP IC process was about 3 GHz. The 7A11 used discrete | ||