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Amit M
Amit M
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The book Microelectronic circuits by sedra and smith,7e, OUP gives the equation for output resistance of a BJT cascode amplifier as:

\$R_{out} = r_{02} + (g_m r_{02})(r_{01} || r_{π2}) \$\$R_{out} = r_{02} + (g_{m2} r_{02})(r_{01} || r_{π2}) \$ as the term \$(1+ g_m r_{02}) \$\$(1+ g_{m2} r_{02}) \$ is nearly equal to \$(g_m r_{02})\$\$(g_{m2} r_{02})\$ assuming \$(g_m r_{02}) >>1 \$\$(g_{m2} r_{02}) >>1 \$.

The book Microelectronic circuits by sedra and smith,7e, OUP gives the equation for output resistance of a BJT cascode amplifier as:

\$R_{out} = r_{02} + (g_m r_{02})(r_{01} || r_{π2}) \$ as the term \$(1+ g_m r_{02}) \$ is nearly equal to \$(g_m r_{02})\$ assuming \$(g_m r_{02}) >>1 \$.

The book Microelectronic circuits by sedra and smith,7e, OUP gives the equation for output resistance of a BJT cascode amplifier as:

\$R_{out} = r_{02} + (g_{m2} r_{02})(r_{01} || r_{π2}) \$ as the term \$(1+ g_{m2} r_{02}) \$ is nearly equal to \$(g_{m2} r_{02})\$ assuming \$(g_{m2} r_{02}) >>1 \$.

Source Link
Amit M
Amit M
  • 1.1k
  • 3
  • 18

The book Microelectronic circuits by sedra and smith,7e, OUP gives the equation for output resistance of a BJT cascode amplifier as:

\$R_{out} = r_{02} + (g_m r_{02})(r_{01} || r_{π2}) \$ as the term \$(1+ g_m r_{02}) \$ is nearly equal to \$(g_m r_{02})\$ assuming \$(g_m r_{02}) >>1 \$.