Chapter 4, Problem 4.22P

The circuit parameters in Figure P4-21 are $R_C=3\text{kΩ,}\beta \text{=100,}{V}_t=0.7\text{V,}$ and $V_{CC}=5\text{V}\text{.}$ Select a value of $R_B$ such that the transistor is in the saturation mode when $v_S\ge 2\text{}\text{V}\text{.}$